diff --git a/async_timeout/__init__.py b/async_timeout/__init__.py
new file mode 100644
index 0000000..179d1b0
--- /dev/null
+++ b/async_timeout/__init__.py
@@ -0,0 +1,247 @@
+import asyncio
+import enum
+import sys
+import warnings
+from types import TracebackType
+from typing import Any, Optional, Type
+
+
+if sys.version_info >= (3, 8):
+    from typing import final
+else:
+    from typing_extensions import final
+
+
+__version__ = "4.0.2"
+
+
+__all__ = ("timeout", "timeout_at", "Timeout")
+
+
+def timeout(delay: Optional[float]) -> "Timeout":
+    """timeout context manager.
+
+    Useful in cases when you want to apply timeout logic around block
+    of code or in cases when asyncio.wait_for is not suitable. For example:
+
+    >>> async with timeout(0.001):
+    ...     async with aiohttp.get('https://github.com') as r:
+    ...         await r.text()
+
+
+    delay - value in seconds or None to disable timeout logic
+    """
+    loop = _get_running_loop()
+    if delay is not None:
+        deadline = loop.time() + delay  # type: Optional[float]
+    else:
+        deadline = None
+    return Timeout(deadline, loop)
+
+
+def timeout_at(deadline: Optional[float]) -> "Timeout":
+    """Schedule the timeout at absolute time.
+
+    deadline argument points on the time in the same clock system
+    as loop.time().
+
+    Please note: it is not POSIX time but a time with
+    undefined starting base, e.g. the time of the system power on.
+
+    >>> async with timeout_at(loop.time() + 10):
+    ...     async with aiohttp.get('https://github.com') as r:
+    ...         await r.text()
+
+
+    """
+    loop = _get_running_loop()
+    return Timeout(deadline, loop)
+
+
+class _State(enum.Enum):
+    INIT = "INIT"
+    ENTER = "ENTER"
+    TIMEOUT = "TIMEOUT"
+    EXIT = "EXIT"
+
+
+@final
+class Timeout:
+    # Internal class, please don't instantiate it directly
+    # Use timeout() and timeout_at() public factories instead.
+    #
+    # Implementation note: `async with timeout()` is preferred
+    # over `with timeout()`.
+    # While technically the Timeout class implementation
+    # doesn't need to be async at all,
+    # the `async with` statement explicitly points that
+    # the context manager should be used from async function context.
+    #
+    # This design allows to avoid many silly misusages.
+    #
+    # TimeoutError is raised immadiatelly when scheduled
+    # if the deadline is passed.
+    # The purpose is to time out as sson as possible
+    # without waiting for the next await expression.
+
+    __slots__ = ("_deadline", "_loop", "_state", "_timeout_handler")
+
+    def __init__(
+        self, deadline: Optional[float], loop: asyncio.AbstractEventLoop
+    ) -> None:
+        self._loop = loop
+        self._state = _State.INIT
+
+        self._timeout_handler = None  # type: Optional[asyncio.Handle]
+        if deadline is None:
+            self._deadline = None  # type: Optional[float]
+        else:
+            self.update(deadline)
+
+    def __enter__(self) -> "Timeout":
+        warnings.warn(
+            "with timeout() is deprecated, use async with timeout() instead",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        self._do_enter()
+        return self
+
+    def __exit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_val: Optional[BaseException],
+        exc_tb: Optional[TracebackType],
+    ) -> Optional[bool]:
+        self._do_exit(exc_type)
+        return None
+
+    async def __aenter__(self) -> "Timeout":
+        self._do_enter()
+        return self
+
+    async def __aexit__(
+        self,
+        exc_type: Optional[Type[BaseException]],
+        exc_val: Optional[BaseException],
+        exc_tb: Optional[TracebackType],
+    ) -> Optional[bool]:
+        self._do_exit(exc_type)
+        return None
+
+    @property
+    def expired(self) -> bool:
+        """Is timeout expired during execution?"""
+        return self._state == _State.TIMEOUT
+
+    @property
+    def deadline(self) -> Optional[float]:
+        return self._deadline
+
+    def reject(self) -> None:
+        """Reject scheduled timeout if any."""
+        # cancel is maybe better name but
+        # task.cancel() raises CancelledError in asyncio world.
+        if self._state not in (_State.INIT, _State.ENTER):
+            raise RuntimeError(f"invalid state {self._state.value}")
+        self._reject()
+
+    def _reject(self) -> None:
+        if self._timeout_handler is not None:
+            self._timeout_handler.cancel()
+            self._timeout_handler = None
+
+    def shift(self, delay: float) -> None:
+        """Advance timeout on delay seconds.
+
+        The delay can be negative.
+
+        Raise RuntimeError if shift is called when deadline is not scheduled
+        """
+        deadline = self._deadline
+        if deadline is None:
+            raise RuntimeError("cannot shift timeout if deadline is not scheduled")
+        self.update(deadline + delay)
+
+    def update(self, deadline: float) -> None:
+        """Set deadline to absolute value.
+
+        deadline argument points on the time in the same clock system
+        as loop.time().
+
+        If new deadline is in the past the timeout is raised immediatelly.
+
+        Please note: it is not POSIX time but a time with
+        undefined starting base, e.g. the time of the system power on.
+        """
+        if self._state == _State.EXIT:
+            raise RuntimeError("cannot reschedule after exit from context manager")
+        if self._state == _State.TIMEOUT:
+            raise RuntimeError("cannot reschedule expired timeout")
+        if self._timeout_handler is not None:
+            self._timeout_handler.cancel()
+        self._deadline = deadline
+        if self._state != _State.INIT:
+            self._reschedule()
+
+    def _reschedule(self) -> None:
+        assert self._state == _State.ENTER
+        deadline = self._deadline
+        if deadline is None:
+            return
+
+        now = self._loop.time()
+        if self._timeout_handler is not None:
+            self._timeout_handler.cancel()
+
+        task = _current_task(self._loop)
+        if deadline <= now:
+            self._timeout_handler = self._loop.call_soon(self._on_timeout, task)
+        else:
+            self._timeout_handler = self._loop.call_at(deadline, self._on_timeout, task)
+
+    def _do_enter(self) -> None:
+        if self._state != _State.INIT:
+            raise RuntimeError(f"invalid state {self._state.value}")
+        self._state = _State.ENTER
+        self._reschedule()
+
+    def _do_exit(self, exc_type: Optional[Type[BaseException]]) -> None:
+        if exc_type is asyncio.CancelledError and self._state == _State.TIMEOUT:
+            self._timeout_handler = None
+            raise asyncio.TimeoutError
+        # timeout has not expired
+        self._state = _State.EXIT
+        self._reject()
+        return None
+
+    def _on_timeout(self, task: "asyncio.Task[None]") -> None:
+        task.cancel()
+        self._state = _State.TIMEOUT
+        # drop the reference early
+        self._timeout_handler = None
+
+
+if sys.version_info >= (3, 7):
+
+    def _current_task(loop: asyncio.AbstractEventLoop) -> "Optional[asyncio.Task[Any]]":
+        return asyncio.current_task(loop=loop)
+
+else:
+
+    def _current_task(loop: asyncio.AbstractEventLoop) -> "Optional[asyncio.Task[Any]]":
+        return asyncio.Task.current_task(loop=loop)
+
+
+if sys.version_info >= (3, 7):
+
+    def _get_running_loop() -> asyncio.AbstractEventLoop:
+        return asyncio.get_running_loop()
+
+else:
+
+    def _get_running_loop() -> asyncio.AbstractEventLoop:
+        loop = asyncio.get_event_loop()
+        if not loop.is_running():
+            raise RuntimeError("no running event loop")
+        return loop
diff --git a/async_timeout/py.typed b/async_timeout/py.typed
new file mode 100644
index 0000000..3b94f91
--- /dev/null
+++ b/async_timeout/py.typed
@@ -0,0 +1 @@
+Placeholder
diff --git a/idna/__init__.py b/idna/__init__.py
new file mode 100644
index 0000000..a40eeaf
--- /dev/null
+++ b/idna/__init__.py
@@ -0,0 +1,44 @@
+from .package_data import __version__
+from .core import (
+    IDNABidiError,
+    IDNAError,
+    InvalidCodepoint,
+    InvalidCodepointContext,
+    alabel,
+    check_bidi,
+    check_hyphen_ok,
+    check_initial_combiner,
+    check_label,
+    check_nfc,
+    decode,
+    encode,
+    ulabel,
+    uts46_remap,
+    valid_contextj,
+    valid_contexto,
+    valid_label_length,
+    valid_string_length,
+)
+from .intranges import intranges_contain
+
+__all__ = [
+    "IDNABidiError",
+    "IDNAError",
+    "InvalidCodepoint",
+    "InvalidCodepointContext",
+    "alabel",
+    "check_bidi",
+    "check_hyphen_ok",
+    "check_initial_combiner",
+    "check_label",
+    "check_nfc",
+    "decode",
+    "encode",
+    "intranges_contain",
+    "ulabel",
+    "uts46_remap",
+    "valid_contextj",
+    "valid_contexto",
+    "valid_label_length",
+    "valid_string_length",
+]
diff --git a/idna/codec.py b/idna/codec.py
new file mode 100644
index 0000000..1ca9ba6
--- /dev/null
+++ b/idna/codec.py
@@ -0,0 +1,112 @@
+from .core import encode, decode, alabel, ulabel, IDNAError
+import codecs
+import re
+from typing import Tuple, Optional
+
+_unicode_dots_re = re.compile('[\u002e\u3002\uff0e\uff61]')
+
+class Codec(codecs.Codec):
+
+    def encode(self, data: str, errors: str = 'strict') -> Tuple[bytes, int]:
+        if errors != 'strict':
+            raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
+
+        if not data:
+            return b"", 0
+
+        return encode(data), len(data)
+
+    def decode(self, data: bytes, errors: str = 'strict') -> Tuple[str, int]:
+        if errors != 'strict':
+            raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
+
+        if not data:
+            return '', 0
+
+        return decode(data), len(data)
+
+class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
+    def _buffer_encode(self, data: str, errors: str, final: bool) -> Tuple[str, int]:  # type: ignore
+        if errors != 'strict':
+            raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
+
+        if not data:
+            return "", 0
+
+        labels = _unicode_dots_re.split(data)
+        trailing_dot = ''
+        if labels:
+            if not labels[-1]:
+                trailing_dot = '.'
+                del labels[-1]
+            elif not final:
+                # Keep potentially unfinished label until the next call
+                del labels[-1]
+                if labels:
+                    trailing_dot = '.'
+
+        result = []
+        size = 0
+        for label in labels:
+            result.append(alabel(label))
+            if size:
+                size += 1
+            size += len(label)
+
+        # Join with U+002E
+        result_str = '.'.join(result) + trailing_dot  # type: ignore
+        size += len(trailing_dot)
+        return result_str, size
+
+class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
+    def _buffer_decode(self, data: str, errors: str, final: bool) -> Tuple[str, int]:  # type: ignore
+        if errors != 'strict':
+            raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
+
+        if not data:
+            return ('', 0)
+
+        labels = _unicode_dots_re.split(data)
+        trailing_dot = ''
+        if labels:
+            if not labels[-1]:
+                trailing_dot = '.'
+                del labels[-1]
+            elif not final:
+                # Keep potentially unfinished label until the next call
+                del labels[-1]
+                if labels:
+                    trailing_dot = '.'
+
+        result = []
+        size = 0
+        for label in labels:
+            result.append(ulabel(label))
+            if size:
+                size += 1
+            size += len(label)
+
+        result_str = '.'.join(result) + trailing_dot
+        size += len(trailing_dot)
+        return (result_str, size)
+
+
+class StreamWriter(Codec, codecs.StreamWriter):
+    pass
+
+
+class StreamReader(Codec, codecs.StreamReader):
+    pass
+
+
+def getregentry() -> codecs.CodecInfo:
+    # Compatibility as a search_function for codecs.register()
+    return codecs.CodecInfo(
+        name='idna',
+        encode=Codec().encode,  # type: ignore
+        decode=Codec().decode,  # type: ignore
+        incrementalencoder=IncrementalEncoder,
+        incrementaldecoder=IncrementalDecoder,
+        streamwriter=StreamWriter,
+        streamreader=StreamReader,
+    )
diff --git a/idna/compat.py b/idna/compat.py
new file mode 100644
index 0000000..786e6bd
--- /dev/null
+++ b/idna/compat.py
@@ -0,0 +1,13 @@
+from .core import *
+from .codec import *
+from typing import Any, Union
+
+def ToASCII(label: str) -> bytes:
+    return encode(label)
+
+def ToUnicode(label: Union[bytes, bytearray]) -> str:
+    return decode(label)
+
+def nameprep(s: Any) -> None:
+    raise NotImplementedError('IDNA 2008 does not utilise nameprep protocol')
+
diff --git a/idna/core.py b/idna/core.py
new file mode 100644
index 0000000..4f30037
--- /dev/null
+++ b/idna/core.py
@@ -0,0 +1,400 @@
+from . import idnadata
+import bisect
+import unicodedata
+import re
+from typing import Union, Optional
+from .intranges import intranges_contain
+
+_virama_combining_class = 9
+_alabel_prefix = b'xn--'
+_unicode_dots_re = re.compile('[\u002e\u3002\uff0e\uff61]')
+
+class IDNAError(UnicodeError):
+    """ Base exception for all IDNA-encoding related problems """
+    pass
+
+
+class IDNABidiError(IDNAError):
+    """ Exception when bidirectional requirements are not satisfied """
+    pass
+
+
+class InvalidCodepoint(IDNAError):
+    """ Exception when a disallowed or unallocated codepoint is used """
+    pass
+
+
+class InvalidCodepointContext(IDNAError):
+    """ Exception when the codepoint is not valid in the context it is used """
+    pass
+
+
+def _combining_class(cp: int) -> int:
+    v = unicodedata.combining(chr(cp))
+    if v == 0:
+        if not unicodedata.name(chr(cp)):
+            raise ValueError('Unknown character in unicodedata')
+    return v
+
+def _is_script(cp: str, script: str) -> bool:
+    return intranges_contain(ord(cp), idnadata.scripts[script])
+
+def _punycode(s: str) -> bytes:
+    return s.encode('punycode')
+
+def _unot(s: int) -> str:
+    return 'U+{:04X}'.format(s)
+
+
+def valid_label_length(label: Union[bytes, str]) -> bool:
+    if len(label) > 63:
+        return False
+    return True
+
+
+def valid_string_length(label: Union[bytes, str], trailing_dot: bool) -> bool:
+    if len(label) > (254 if trailing_dot else 253):
+        return False
+    return True
+
+
+def check_bidi(label: str, check_ltr: bool = False) -> bool:
+    # Bidi rules should only be applied if string contains RTL characters
+    bidi_label = False
+    for (idx, cp) in enumerate(label, 1):
+        direction = unicodedata.bidirectional(cp)
+        if direction == '':
+            # String likely comes from a newer version of Unicode
+            raise IDNABidiError('Unknown directionality in label {} at position {}'.format(repr(label), idx))
+        if direction in ['R', 'AL', 'AN']:
+            bidi_label = True
+    if not bidi_label and not check_ltr:
+        return True
+
+    # Bidi rule 1
+    direction = unicodedata.bidirectional(label[0])
+    if direction in ['R', 'AL']:
+        rtl = True
+    elif direction == 'L':
+        rtl = False
+    else:
+        raise IDNABidiError('First codepoint in label {} must be directionality L, R or AL'.format(repr(label)))
+
+    valid_ending = False
+    number_type = None  # type: Optional[str]
+    for (idx, cp) in enumerate(label, 1):
+        direction = unicodedata.bidirectional(cp)
+
+        if rtl:
+            # Bidi rule 2
+            if not direction in ['R', 'AL', 'AN', 'EN', 'ES', 'CS', 'ET', 'ON', 'BN', 'NSM']:
+                raise IDNABidiError('Invalid direction for codepoint at position {} in a right-to-left label'.format(idx))
+            # Bidi rule 3
+            if direction in ['R', 'AL', 'EN', 'AN']:
+                valid_ending = True
+            elif direction != 'NSM':
+                valid_ending = False
+            # Bidi rule 4
+            if direction in ['AN', 'EN']:
+                if not number_type:
+                    number_type = direction
+                else:
+                    if number_type != direction:
+                        raise IDNABidiError('Can not mix numeral types in a right-to-left label')
+        else:
+            # Bidi rule 5
+            if not direction in ['L', 'EN', 'ES', 'CS', 'ET', 'ON', 'BN', 'NSM']:
+                raise IDNABidiError('Invalid direction for codepoint at position {} in a left-to-right label'.format(idx))
+            # Bidi rule 6
+            if direction in ['L', 'EN']:
+                valid_ending = True
+            elif direction != 'NSM':
+                valid_ending = False
+
+    if not valid_ending:
+        raise IDNABidiError('Label ends with illegal codepoint directionality')
+
+    return True
+
+
+def check_initial_combiner(label: str) -> bool:
+    if unicodedata.category(label[0])[0] == 'M':
+        raise IDNAError('Label begins with an illegal combining character')
+    return True
+
+
+def check_hyphen_ok(label: str) -> bool:
+    if label[2:4] == '--':
+        raise IDNAError('Label has disallowed hyphens in 3rd and 4th position')
+    if label[0] == '-' or label[-1] == '-':
+        raise IDNAError('Label must not start or end with a hyphen')
+    return True
+
+
+def check_nfc(label: str) -> None:
+    if unicodedata.normalize('NFC', label) != label:
+        raise IDNAError('Label must be in Normalization Form C')
+
+
+def valid_contextj(label: str, pos: int) -> bool:
+    cp_value = ord(label[pos])
+
+    if cp_value == 0x200c:
+
+        if pos > 0:
+            if _combining_class(ord(label[pos - 1])) == _virama_combining_class:
+                return True
+
+        ok = False
+        for i in range(pos-1, -1, -1):
+            joining_type = idnadata.joining_types.get(ord(label[i]))
+            if joining_type == ord('T'):
+                continue
+            if joining_type in [ord('L'), ord('D')]:
+                ok = True
+                break
+
+        if not ok:
+            return False
+
+        ok = False
+        for i in range(pos+1, len(label)):
+            joining_type = idnadata.joining_types.get(ord(label[i]))
+            if joining_type == ord('T'):
+                continue
+            if joining_type in [ord('R'), ord('D')]:
+                ok = True
+                break
+        return ok
+
+    if cp_value == 0x200d:
+
+        if pos > 0:
+            if _combining_class(ord(label[pos - 1])) == _virama_combining_class:
+                return True
+        return False
+
+    else:
+
+        return False
+
+
+def valid_contexto(label: str, pos: int, exception: bool = False) -> bool:
+    cp_value = ord(label[pos])
+
+    if cp_value == 0x00b7:
+        if 0 < pos < len(label)-1:
+            if ord(label[pos - 1]) == 0x006c and ord(label[pos + 1]) == 0x006c:
+                return True
+        return False
+
+    elif cp_value == 0x0375:
+        if pos < len(label)-1 and len(label) > 1:
+            return _is_script(label[pos + 1], 'Greek')
+        return False
+
+    elif cp_value == 0x05f3 or cp_value == 0x05f4:
+        if pos > 0:
+            return _is_script(label[pos - 1], 'Hebrew')
+        return False
+
+    elif cp_value == 0x30fb:
+        for cp in label:
+            if cp == '\u30fb':
+                continue
+            if _is_script(cp, 'Hiragana') or _is_script(cp, 'Katakana') or _is_script(cp, 'Han'):
+                return True
+        return False
+
+    elif 0x660 <= cp_value <= 0x669:
+        for cp in label:
+            if 0x6f0 <= ord(cp) <= 0x06f9:
+                return False
+        return True
+
+    elif 0x6f0 <= cp_value <= 0x6f9:
+        for cp in label:
+            if 0x660 <= ord(cp) <= 0x0669:
+                return False
+        return True
+
+    return False
+
+
+def check_label(label: Union[str, bytes, bytearray]) -> None:
+    if isinstance(label, (bytes, bytearray)):
+        label = label.decode('utf-8')
+    if len(label) == 0:
+        raise IDNAError('Empty Label')
+
+    check_nfc(label)
+    check_hyphen_ok(label)
+    check_initial_combiner(label)
+
+    for (pos, cp) in enumerate(label):
+        cp_value = ord(cp)
+        if intranges_contain(cp_value, idnadata.codepoint_classes['PVALID']):
+            continue
+        elif intranges_contain(cp_value, idnadata.codepoint_classes['CONTEXTJ']):
+            try:
+                if not valid_contextj(label, pos):
+                    raise InvalidCodepointContext('Joiner {} not allowed at position {} in {}'.format(
+                        _unot(cp_value), pos+1, repr(label)))
+            except ValueError:
+                raise IDNAError('Unknown codepoint adjacent to joiner {} at position {} in {}'.format(
+                    _unot(cp_value), pos+1, repr(label)))
+        elif intranges_contain(cp_value, idnadata.codepoint_classes['CONTEXTO']):
+            if not valid_contexto(label, pos):
+                raise InvalidCodepointContext('Codepoint {} not allowed at position {} in {}'.format(_unot(cp_value), pos+1, repr(label)))
+        else:
+            raise InvalidCodepoint('Codepoint {} at position {} of {} not allowed'.format(_unot(cp_value), pos+1, repr(label)))
+
+    check_bidi(label)
+
+
+def alabel(label: str) -> bytes:
+    try:
+        label_bytes = label.encode('ascii')
+        ulabel(label_bytes)
+        if not valid_label_length(label_bytes):
+            raise IDNAError('Label too long')
+        return label_bytes
+    except UnicodeEncodeError:
+        pass
+
+    if not label:
+        raise IDNAError('No Input')
+
+    label = str(label)
+    check_label(label)
+    label_bytes = _punycode(label)
+    label_bytes = _alabel_prefix + label_bytes
+
+    if not valid_label_length(label_bytes):
+        raise IDNAError('Label too long')
+
+    return label_bytes
+
+
+def ulabel(label: Union[str, bytes, bytearray]) -> str:
+    if not isinstance(label, (bytes, bytearray)):
+        try:
+            label_bytes = label.encode('ascii')
+        except UnicodeEncodeError:
+            check_label(label)
+            return label
+    else:
+        label_bytes = label
+
+    label_bytes = label_bytes.lower()
+    if label_bytes.startswith(_alabel_prefix):
+        label_bytes = label_bytes[len(_alabel_prefix):]
+        if not label_bytes:
+            raise IDNAError('Malformed A-label, no Punycode eligible content found')
+        if label_bytes.decode('ascii')[-1] == '-':
+            raise IDNAError('A-label must not end with a hyphen')
+    else:
+        check_label(label_bytes)
+        return label_bytes.decode('ascii')
+
+    try:
+        label = label_bytes.decode('punycode')
+    except UnicodeError:
+        raise IDNAError('Invalid A-label')
+    check_label(label)
+    return label
+
+
+def uts46_remap(domain: str, std3_rules: bool = True, transitional: bool = False) -> str:
+    """Re-map the characters in the string according to UTS46 processing."""
+    from .uts46data import uts46data
+    output = ''
+
+    for pos, char in enumerate(domain):
+        code_point = ord(char)
+        try:
+            uts46row = uts46data[code_point if code_point < 256 else
+                bisect.bisect_left(uts46data, (code_point, 'Z')) - 1]
+            status = uts46row[1]
+            replacement = None  # type: Optional[str]
+            if len(uts46row) == 3:
+                replacement = uts46row[2]  # type: ignore
+            if (status == 'V' or
+                    (status == 'D' and not transitional) or
+                    (status == '3' and not std3_rules and replacement is None)):
+                output += char
+            elif replacement is not None and (status == 'M' or
+                    (status == '3' and not std3_rules) or
+                    (status == 'D' and transitional)):
+                output += replacement
+            elif status != 'I':
+                raise IndexError()
+        except IndexError:
+            raise InvalidCodepoint(
+                'Codepoint {} not allowed at position {} in {}'.format(
+                _unot(code_point), pos + 1, repr(domain)))
+
+    return unicodedata.normalize('NFC', output)
+
+
+def encode(s: Union[str, bytes, bytearray], strict: bool = False, uts46: bool = False, std3_rules: bool = False, transitional: bool = False) -> bytes:
+    if isinstance(s, (bytes, bytearray)):
+        try:
+            s = s.decode('ascii')
+        except UnicodeDecodeError:
+            raise IDNAError('should pass a unicode string to the function rather than a byte string.')
+    if uts46:
+        s = uts46_remap(s, std3_rules, transitional)
+    trailing_dot = False
+    result = []
+    if strict:
+        labels = s.split('.')
+    else:
+        labels = _unicode_dots_re.split(s)
+    if not labels or labels == ['']:
+        raise IDNAError('Empty domain')
+    if labels[-1] == '':
+        del labels[-1]
+        trailing_dot = True
+    for label in labels:
+        s = alabel(label)
+        if s:
+            result.append(s)
+        else:
+            raise IDNAError('Empty label')
+    if trailing_dot:
+        result.append(b'')
+    s = b'.'.join(result)
+    if not valid_string_length(s, trailing_dot):
+        raise IDNAError('Domain too long')
+    return s
+
+
+def decode(s: Union[str, bytes, bytearray], strict: bool = False, uts46: bool = False, std3_rules: bool = False) -> str:
+    try:
+        if isinstance(s, (bytes, bytearray)):
+            s = s.decode('ascii')
+    except UnicodeDecodeError:
+        raise IDNAError('Invalid ASCII in A-label')
+    if uts46:
+        s = uts46_remap(s, std3_rules, False)
+    trailing_dot = False
+    result = []
+    if not strict:
+        labels = _unicode_dots_re.split(s)
+    else:
+        labels = s.split('.')
+    if not labels or labels == ['']:
+        raise IDNAError('Empty domain')
+    if not labels[-1]:
+        del labels[-1]
+        trailing_dot = True
+    for label in labels:
+        s = ulabel(label)
+        if s:
+            result.append(s)
+        else:
+            raise IDNAError('Empty label')
+    if trailing_dot:
+        result.append('')
+    return '.'.join(result)
diff --git a/idna/idnadata.py b/idna/idnadata.py
new file mode 100644
index 0000000..67db462
--- /dev/null
+++ b/idna/idnadata.py
@@ -0,0 +1,2151 @@
+# This file is automatically generated by tools/idna-data
+
+__version__ = '15.0.0'
+scripts = {
+    'Greek': (
+        0x37000000374,
+        0x37500000378,
+        0x37a0000037e,
+        0x37f00000380,
+        0x38400000385,
+        0x38600000387,
+        0x3880000038b,
+        0x38c0000038d,
+        0x38e000003a2,
+        0x3a3000003e2,
+        0x3f000000400,
+        0x1d2600001d2b,
+        0x1d5d00001d62,
+        0x1d6600001d6b,
+        0x1dbf00001dc0,
+        0x1f0000001f16,
+        0x1f1800001f1e,
+        0x1f2000001f46,
+        0x1f4800001f4e,
+        0x1f5000001f58,
+        0x1f5900001f5a,
+        0x1f5b00001f5c,
+        0x1f5d00001f5e,
+        0x1f5f00001f7e,
+        0x1f8000001fb5,
+        0x1fb600001fc5,
+        0x1fc600001fd4,
+        0x1fd600001fdc,
+        0x1fdd00001ff0,
+        0x1ff200001ff5,
+        0x1ff600001fff,
+        0x212600002127,
+        0xab650000ab66,
+        0x101400001018f,
+        0x101a0000101a1,
+        0x1d2000001d246,
+    ),
+    'Han': (
+        0x2e8000002e9a,
+        0x2e9b00002ef4,
+        0x2f0000002fd6,
+        0x300500003006,
+        0x300700003008,
+        0x30210000302a,
+        0x30380000303c,
+        0x340000004dc0,
+        0x4e000000a000,
+        0xf9000000fa6e,
+        0xfa700000fada,
+        0x16fe200016fe4,
+        0x16ff000016ff2,
+        0x200000002a6e0,
+        0x2a7000002b73a,
+        0x2b7400002b81e,
+        0x2b8200002cea2,
+        0x2ceb00002ebe1,
+        0x2f8000002fa1e,
+        0x300000003134b,
+        0x31350000323b0,
+    ),
+    'Hebrew': (
+        0x591000005c8,
+        0x5d0000005eb,
+        0x5ef000005f5,
+        0xfb1d0000fb37,
+        0xfb380000fb3d,
+        0xfb3e0000fb3f,
+        0xfb400000fb42,
+        0xfb430000fb45,
+        0xfb460000fb50,
+    ),
+    'Hiragana': (
+        0x304100003097,
+        0x309d000030a0,
+        0x1b0010001b120,
+        0x1b1320001b133,
+        0x1b1500001b153,
+        0x1f2000001f201,
+    ),
+    'Katakana': (
+        0x30a1000030fb,
+        0x30fd00003100,
+        0x31f000003200,
+        0x32d0000032ff,
+        0x330000003358,
+        0xff660000ff70,
+        0xff710000ff9e,
+        0x1aff00001aff4,
+        0x1aff50001affc,
+        0x1affd0001afff,
+        0x1b0000001b001,
+        0x1b1200001b123,
+        0x1b1550001b156,
+        0x1b1640001b168,
+    ),
+}
+joining_types = {
+    0x600: 85,
+    0x601: 85,
+    0x602: 85,
+    0x603: 85,
+    0x604: 85,
+    0x605: 85,
+    0x608: 85,
+    0x60b: 85,
+    0x620: 68,
+    0x621: 85,
+    0x622: 82,
+    0x623: 82,
+    0x624: 82,
+    0x625: 82,
+    0x626: 68,
+    0x627: 82,
+    0x628: 68,
+    0x629: 82,
+    0x62a: 68,
+    0x62b: 68,
+    0x62c: 68,
+    0x62d: 68,
+    0x62e: 68,
+    0x62f: 82,
+    0x630: 82,
+    0x631: 82,
+    0x632: 82,
+    0x633: 68,
+    0x634: 68,
+    0x635: 68,
+    0x636: 68,
+    0x637: 68,
+    0x638: 68,
+    0x639: 68,
+    0x63a: 68,
+    0x63b: 68,
+    0x63c: 68,
+    0x63d: 68,
+    0x63e: 68,
+    0x63f: 68,
+    0x640: 67,
+    0x641: 68,
+    0x642: 68,
+    0x643: 68,
+    0x644: 68,
+    0x645: 68,
+    0x646: 68,
+    0x647: 68,
+    0x648: 82,
+    0x649: 68,
+    0x64a: 68,
+    0x66e: 68,
+    0x66f: 68,
+    0x671: 82,
+    0x672: 82,
+    0x673: 82,
+    0x674: 85,
+    0x675: 82,
+    0x676: 82,
+    0x677: 82,
+    0x678: 68,
+    0x679: 68,
+    0x67a: 68,
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+    0x67c: 68,
+    0x67d: 68,
+    0x67e: 68,
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+    0x684: 68,
+    0x685: 68,
+    0x686: 68,
+    0x687: 68,
+    0x688: 82,
+    0x689: 82,
+    0x68a: 82,
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+    0x68e: 82,
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+    0x692: 82,
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+    0x694: 82,
+    0x695: 82,
+    0x696: 82,
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+    0x699: 82,
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+    0x6c2: 68,
+    0x6c3: 82,
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+    0x6dd: 85,
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+    0x6fa: 68,
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+    0x70f: 84,
+    0x710: 82,
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+    0x715: 82,
+    0x716: 82,
+    0x717: 82,
+    0x718: 82,
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+    0x18a1: 68,
+    0x18a2: 68,
+    0x18a3: 68,
+    0x18a4: 68,
+    0x18a5: 68,
+    0x18a6: 68,
+    0x18a7: 68,
+    0x18a8: 68,
+    0x18aa: 68,
+    0x200c: 85,
+    0x200d: 67,
+    0x202f: 85,
+    0x2066: 85,
+    0x2067: 85,
+    0x2068: 85,
+    0x2069: 85,
+    0xa840: 68,
+    0xa841: 68,
+    0xa842: 68,
+    0xa843: 68,
+    0xa844: 68,
+    0xa845: 68,
+    0xa846: 68,
+    0xa847: 68,
+    0xa848: 68,
+    0xa849: 68,
+    0xa84a: 68,
+    0xa84b: 68,
+    0xa84c: 68,
+    0xa84d: 68,
+    0xa84e: 68,
+    0xa84f: 68,
+    0xa850: 68,
+    0xa851: 68,
+    0xa852: 68,
+    0xa853: 68,
+    0xa854: 68,
+    0xa855: 68,
+    0xa856: 68,
+    0xa857: 68,
+    0xa858: 68,
+    0xa859: 68,
+    0xa85a: 68,
+    0xa85b: 68,
+    0xa85c: 68,
+    0xa85d: 68,
+    0xa85e: 68,
+    0xa85f: 68,
+    0xa860: 68,
+    0xa861: 68,
+    0xa862: 68,
+    0xa863: 68,
+    0xa864: 68,
+    0xa865: 68,
+    0xa866: 68,
+    0xa867: 68,
+    0xa868: 68,
+    0xa869: 68,
+    0xa86a: 68,
+    0xa86b: 68,
+    0xa86c: 68,
+    0xa86d: 68,
+    0xa86e: 68,
+    0xa86f: 68,
+    0xa870: 68,
+    0xa871: 68,
+    0xa872: 76,
+    0xa873: 85,
+    0x10ac0: 68,
+    0x10ac1: 68,
+    0x10ac2: 68,
+    0x10ac3: 68,
+    0x10ac4: 68,
+    0x10ac5: 82,
+    0x10ac6: 85,
+    0x10ac7: 82,
+    0x10ac8: 85,
+    0x10ac9: 82,
+    0x10aca: 82,
+    0x10acb: 85,
+    0x10acc: 85,
+    0x10acd: 76,
+    0x10ace: 82,
+    0x10acf: 82,
+    0x10ad0: 82,
+    0x10ad1: 82,
+    0x10ad2: 82,
+    0x10ad3: 68,
+    0x10ad4: 68,
+    0x10ad5: 68,
+    0x10ad6: 68,
+    0x10ad7: 76,
+    0x10ad8: 68,
+    0x10ad9: 68,
+    0x10ada: 68,
+    0x10adb: 68,
+    0x10adc: 68,
+    0x10add: 82,
+    0x10ade: 68,
+    0x10adf: 68,
+    0x10ae0: 68,
+    0x10ae1: 82,
+    0x10ae2: 85,
+    0x10ae3: 85,
+    0x10ae4: 82,
+    0x10aeb: 68,
+    0x10aec: 68,
+    0x10aed: 68,
+    0x10aee: 68,
+    0x10aef: 82,
+    0x10b80: 68,
+    0x10b81: 82,
+    0x10b82: 68,
+    0x10b83: 82,
+    0x10b84: 82,
+    0x10b85: 82,
+    0x10b86: 68,
+    0x10b87: 68,
+    0x10b88: 68,
+    0x10b89: 82,
+    0x10b8a: 68,
+    0x10b8b: 68,
+    0x10b8c: 82,
+    0x10b8d: 68,
+    0x10b8e: 82,
+    0x10b8f: 82,
+    0x10b90: 68,
+    0x10b91: 82,
+    0x10ba9: 82,
+    0x10baa: 82,
+    0x10bab: 82,
+    0x10bac: 82,
+    0x10bad: 68,
+    0x10bae: 68,
+    0x10baf: 85,
+    0x10d00: 76,
+    0x10d01: 68,
+    0x10d02: 68,
+    0x10d03: 68,
+    0x10d04: 68,
+    0x10d05: 68,
+    0x10d06: 68,
+    0x10d07: 68,
+    0x10d08: 68,
+    0x10d09: 68,
+    0x10d0a: 68,
+    0x10d0b: 68,
+    0x10d0c: 68,
+    0x10d0d: 68,
+    0x10d0e: 68,
+    0x10d0f: 68,
+    0x10d10: 68,
+    0x10d11: 68,
+    0x10d12: 68,
+    0x10d13: 68,
+    0x10d14: 68,
+    0x10d15: 68,
+    0x10d16: 68,
+    0x10d17: 68,
+    0x10d18: 68,
+    0x10d19: 68,
+    0x10d1a: 68,
+    0x10d1b: 68,
+    0x10d1c: 68,
+    0x10d1d: 68,
+    0x10d1e: 68,
+    0x10d1f: 68,
+    0x10d20: 68,
+    0x10d21: 68,
+    0x10d22: 82,
+    0x10d23: 68,
+    0x10f30: 68,
+    0x10f31: 68,
+    0x10f32: 68,
+    0x10f33: 82,
+    0x10f34: 68,
+    0x10f35: 68,
+    0x10f36: 68,
+    0x10f37: 68,
+    0x10f38: 68,
+    0x10f39: 68,
+    0x10f3a: 68,
+    0x10f3b: 68,
+    0x10f3c: 68,
+    0x10f3d: 68,
+    0x10f3e: 68,
+    0x10f3f: 68,
+    0x10f40: 68,
+    0x10f41: 68,
+    0x10f42: 68,
+    0x10f43: 68,
+    0x10f44: 68,
+    0x10f45: 85,
+    0x10f51: 68,
+    0x10f52: 68,
+    0x10f53: 68,
+    0x10f54: 82,
+    0x10f70: 68,
+    0x10f71: 68,
+    0x10f72: 68,
+    0x10f73: 68,
+    0x10f74: 82,
+    0x10f75: 82,
+    0x10f76: 68,
+    0x10f77: 68,
+    0x10f78: 68,
+    0x10f79: 68,
+    0x10f7a: 68,
+    0x10f7b: 68,
+    0x10f7c: 68,
+    0x10f7d: 68,
+    0x10f7e: 68,
+    0x10f7f: 68,
+    0x10f80: 68,
+    0x10f81: 68,
+    0x10fb0: 68,
+    0x10fb1: 85,
+    0x10fb2: 68,
+    0x10fb3: 68,
+    0x10fb4: 82,
+    0x10fb5: 82,
+    0x10fb6: 82,
+    0x10fb7: 85,
+    0x10fb8: 68,
+    0x10fb9: 82,
+    0x10fba: 82,
+    0x10fbb: 68,
+    0x10fbc: 68,
+    0x10fbd: 82,
+    0x10fbe: 68,
+    0x10fbf: 68,
+    0x10fc0: 85,
+    0x10fc1: 68,
+    0x10fc2: 82,
+    0x10fc3: 82,
+    0x10fc4: 68,
+    0x10fc5: 85,
+    0x10fc6: 85,
+    0x10fc7: 85,
+    0x10fc8: 85,
+    0x10fc9: 82,
+    0x10fca: 68,
+    0x10fcb: 76,
+    0x110bd: 85,
+    0x110cd: 85,
+    0x1e900: 68,
+    0x1e901: 68,
+    0x1e902: 68,
+    0x1e903: 68,
+    0x1e904: 68,
+    0x1e905: 68,
+    0x1e906: 68,
+    0x1e907: 68,
+    0x1e908: 68,
+    0x1e909: 68,
+    0x1e90a: 68,
+    0x1e90b: 68,
+    0x1e90c: 68,
+    0x1e90d: 68,
+    0x1e90e: 68,
+    0x1e90f: 68,
+    0x1e910: 68,
+    0x1e911: 68,
+    0x1e912: 68,
+    0x1e913: 68,
+    0x1e914: 68,
+    0x1e915: 68,
+    0x1e916: 68,
+    0x1e917: 68,
+    0x1e918: 68,
+    0x1e919: 68,
+    0x1e91a: 68,
+    0x1e91b: 68,
+    0x1e91c: 68,
+    0x1e91d: 68,
+    0x1e91e: 68,
+    0x1e91f: 68,
+    0x1e920: 68,
+    0x1e921: 68,
+    0x1e922: 68,
+    0x1e923: 68,
+    0x1e924: 68,
+    0x1e925: 68,
+    0x1e926: 68,
+    0x1e927: 68,
+    0x1e928: 68,
+    0x1e929: 68,
+    0x1e92a: 68,
+    0x1e92b: 68,
+    0x1e92c: 68,
+    0x1e92d: 68,
+    0x1e92e: 68,
+    0x1e92f: 68,
+    0x1e930: 68,
+    0x1e931: 68,
+    0x1e932: 68,
+    0x1e933: 68,
+    0x1e934: 68,
+    0x1e935: 68,
+    0x1e936: 68,
+    0x1e937: 68,
+    0x1e938: 68,
+    0x1e939: 68,
+    0x1e93a: 68,
+    0x1e93b: 68,
+    0x1e93c: 68,
+    0x1e93d: 68,
+    0x1e93e: 68,
+    0x1e93f: 68,
+    0x1e940: 68,
+    0x1e941: 68,
+    0x1e942: 68,
+    0x1e943: 68,
+    0x1e94b: 84,
+}
+codepoint_classes = {
+    'PVALID': (
+        0x2d0000002e,
+        0x300000003a,
+        0x610000007b,
+        0xdf000000f7,
+        0xf800000100,
+        0x10100000102,
+        0x10300000104,
+        0x10500000106,
+        0x10700000108,
+        0x1090000010a,
+        0x10b0000010c,
+        0x10d0000010e,
+        0x10f00000110,
+        0x11100000112,
+        0x11300000114,
+        0x11500000116,
+        0x11700000118,
+        0x1190000011a,
+        0x11b0000011c,
+        0x11d0000011e,
+        0x11f00000120,
+        0x12100000122,
+        0x12300000124,
+        0x12500000126,
+        0x12700000128,
+        0x1290000012a,
+        0x12b0000012c,
+        0x12d0000012e,
+        0x12f00000130,
+        0x13100000132,
+        0x13500000136,
+        0x13700000139,
+        0x13a0000013b,
+        0x13c0000013d,
+        0x13e0000013f,
+        0x14200000143,
+        0x14400000145,
+        0x14600000147,
+        0x14800000149,
+        0x14b0000014c,
+        0x14d0000014e,
+        0x14f00000150,
+        0x15100000152,
+        0x15300000154,
+        0x15500000156,
+        0x15700000158,
+        0x1590000015a,
+        0x15b0000015c,
+        0x15d0000015e,
+        0x15f00000160,
+        0x16100000162,
+        0x16300000164,
+        0x16500000166,
+        0x16700000168,
+        0x1690000016a,
+        0x16b0000016c,
+        0x16d0000016e,
+        0x16f00000170,
+        0x17100000172,
+        0x17300000174,
+        0x17500000176,
+        0x17700000178,
+        0x17a0000017b,
+        0x17c0000017d,
+        0x17e0000017f,
+        0x18000000181,
+        0x18300000184,
+        0x18500000186,
+        0x18800000189,
+        0x18c0000018e,
+        0x19200000193,
+        0x19500000196,
+        0x1990000019c,
+        0x19e0000019f,
+        0x1a1000001a2,
+        0x1a3000001a4,
+        0x1a5000001a6,
+        0x1a8000001a9,
+        0x1aa000001ac,
+        0x1ad000001ae,
+        0x1b0000001b1,
+        0x1b4000001b5,
+        0x1b6000001b7,
+        0x1b9000001bc,
+        0x1bd000001c4,
+        0x1ce000001cf,
+        0x1d0000001d1,
+        0x1d2000001d3,
+        0x1d4000001d5,
+        0x1d6000001d7,
+        0x1d8000001d9,
+        0x1da000001db,
+        0x1dc000001de,
+        0x1df000001e0,
+        0x1e1000001e2,
+        0x1e3000001e4,
+        0x1e5000001e6,
+        0x1e7000001e8,
+        0x1e9000001ea,
+        0x1eb000001ec,
+        0x1ed000001ee,
+        0x1ef000001f1,
+        0x1f5000001f6,
+        0x1f9000001fa,
+        0x1fb000001fc,
+        0x1fd000001fe,
+        0x1ff00000200,
+        0x20100000202,
+        0x20300000204,
+        0x20500000206,
+        0x20700000208,
+        0x2090000020a,
+        0x20b0000020c,
+        0x20d0000020e,
+        0x20f00000210,
+        0x21100000212,
+        0x21300000214,
+        0x21500000216,
+        0x21700000218,
+        0x2190000021a,
+        0x21b0000021c,
+        0x21d0000021e,
+        0x21f00000220,
+        0x22100000222,
+        0x22300000224,
+        0x22500000226,
+        0x22700000228,
+        0x2290000022a,
+        0x22b0000022c,
+        0x22d0000022e,
+        0x22f00000230,
+        0x23100000232,
+        0x2330000023a,
+        0x23c0000023d,
+        0x23f00000241,
+        0x24200000243,
+        0x24700000248,
+        0x2490000024a,
+        0x24b0000024c,
+        0x24d0000024e,
+        0x24f000002b0,
+        0x2b9000002c2,
+        0x2c6000002d2,
+        0x2ec000002ed,
+        0x2ee000002ef,
+        0x30000000340,
+        0x34200000343,
+        0x3460000034f,
+        0x35000000370,
+        0x37100000372,
+        0x37300000374,
+        0x37700000378,
+        0x37b0000037e,
+        0x39000000391,
+        0x3ac000003cf,
+        0x3d7000003d8,
+        0x3d9000003da,
+        0x3db000003dc,
+        0x3dd000003de,
+        0x3df000003e0,
+        0x3e1000003e2,
+        0x3e3000003e4,
+        0x3e5000003e6,
+        0x3e7000003e8,
+        0x3e9000003ea,
+        0x3eb000003ec,
+        0x3ed000003ee,
+        0x3ef000003f0,
+        0x3f3000003f4,
+        0x3f8000003f9,
+        0x3fb000003fd,
+        0x43000000460,
+        0x46100000462,
+        0x46300000464,
+        0x46500000466,
+        0x46700000468,
+        0x4690000046a,
+        0x46b0000046c,
+        0x46d0000046e,
+        0x46f00000470,
+        0x47100000472,
+        0x47300000474,
+        0x47500000476,
+        0x47700000478,
+        0x4790000047a,
+        0x47b0000047c,
+        0x47d0000047e,
+        0x47f00000480,
+        0x48100000482,
+        0x48300000488,
+        0x48b0000048c,
+        0x48d0000048e,
+        0x48f00000490,
+        0x49100000492,
+        0x49300000494,
+        0x49500000496,
+        0x49700000498,
+        0x4990000049a,
+        0x49b0000049c,
+        0x49d0000049e,
+        0x49f000004a0,
+        0x4a1000004a2,
+        0x4a3000004a4,
+        0x4a5000004a6,
+        0x4a7000004a8,
+        0x4a9000004aa,
+        0x4ab000004ac,
+        0x4ad000004ae,
+        0x4af000004b0,
+        0x4b1000004b2,
+        0x4b3000004b4,
+        0x4b5000004b6,
+        0x4b7000004b8,
+        0x4b9000004ba,
+        0x4bb000004bc,
+        0x4bd000004be,
+        0x4bf000004c0,
+        0x4c2000004c3,
+        0x4c4000004c5,
+        0x4c6000004c7,
+        0x4c8000004c9,
+        0x4ca000004cb,
+        0x4cc000004cd,
+        0x4ce000004d0,
+        0x4d1000004d2,
+        0x4d3000004d4,
+        0x4d5000004d6,
+        0x4d7000004d8,
+        0x4d9000004da,
+        0x4db000004dc,
+        0x4dd000004de,
+        0x4df000004e0,
+        0x4e1000004e2,
+        0x4e3000004e4,
+        0x4e5000004e6,
+        0x4e7000004e8,
+        0x4e9000004ea,
+        0x4eb000004ec,
+        0x4ed000004ee,
+        0x4ef000004f0,
+        0x4f1000004f2,
+        0x4f3000004f4,
+        0x4f5000004f6,
+        0x4f7000004f8,
+        0x4f9000004fa,
+        0x4fb000004fc,
+        0x4fd000004fe,
+        0x4ff00000500,
+        0x50100000502,
+        0x50300000504,
+        0x50500000506,
+        0x50700000508,
+        0x5090000050a,
+        0x50b0000050c,
+        0x50d0000050e,
+        0x50f00000510,
+        0x51100000512,
+        0x51300000514,
+        0x51500000516,
+        0x51700000518,
+        0x5190000051a,
+        0x51b0000051c,
+        0x51d0000051e,
+        0x51f00000520,
+        0x52100000522,
+        0x52300000524,
+        0x52500000526,
+        0x52700000528,
+        0x5290000052a,
+        0x52b0000052c,
+        0x52d0000052e,
+        0x52f00000530,
+        0x5590000055a,
+        0x56000000587,
+        0x58800000589,
+        0x591000005be,
+        0x5bf000005c0,
+        0x5c1000005c3,
+        0x5c4000005c6,
+        0x5c7000005c8,
+        0x5d0000005eb,
+        0x5ef000005f3,
+        0x6100000061b,
+        0x62000000640,
+        0x64100000660,
+        0x66e00000675,
+        0x679000006d4,
+        0x6d5000006dd,
+        0x6df000006e9,
+        0x6ea000006f0,
+        0x6fa00000700,
+        0x7100000074b,
+        0x74d000007b2,
+        0x7c0000007f6,
+        0x7fd000007fe,
+        0x8000000082e,
+        0x8400000085c,
+        0x8600000086b,
+        0x87000000888,
+        0x8890000088f,
+        0x898000008e2,
+        0x8e300000958,
+        0x96000000964,
+        0x96600000970,
+        0x97100000984,
+        0x9850000098d,
+        0x98f00000991,
+        0x993000009a9,
+        0x9aa000009b1,
+        0x9b2000009b3,
+        0x9b6000009ba,
+        0x9bc000009c5,
+        0x9c7000009c9,
+        0x9cb000009cf,
+        0x9d7000009d8,
+        0x9e0000009e4,
+        0x9e6000009f2,
+        0x9fc000009fd,
+        0x9fe000009ff,
+        0xa0100000a04,
+        0xa0500000a0b,
+        0xa0f00000a11,
+        0xa1300000a29,
+        0xa2a00000a31,
+        0xa3200000a33,
+        0xa3500000a36,
+        0xa3800000a3a,
+        0xa3c00000a3d,
+        0xa3e00000a43,
+        0xa4700000a49,
+        0xa4b00000a4e,
+        0xa5100000a52,
+        0xa5c00000a5d,
+        0xa6600000a76,
+        0xa8100000a84,
+        0xa8500000a8e,
+        0xa8f00000a92,
+        0xa9300000aa9,
+        0xaaa00000ab1,
+        0xab200000ab4,
+        0xab500000aba,
+        0xabc00000ac6,
+        0xac700000aca,
+        0xacb00000ace,
+        0xad000000ad1,
+        0xae000000ae4,
+        0xae600000af0,
+        0xaf900000b00,
+        0xb0100000b04,
+        0xb0500000b0d,
+        0xb0f00000b11,
+        0xb1300000b29,
+        0xb2a00000b31,
+        0xb3200000b34,
+        0xb3500000b3a,
+        0xb3c00000b45,
+        0xb4700000b49,
+        0xb4b00000b4e,
+        0xb5500000b58,
+        0xb5f00000b64,
+        0xb6600000b70,
+        0xb7100000b72,
+        0xb8200000b84,
+        0xb8500000b8b,
+        0xb8e00000b91,
+        0xb9200000b96,
+        0xb9900000b9b,
+        0xb9c00000b9d,
+        0xb9e00000ba0,
+        0xba300000ba5,
+        0xba800000bab,
+        0xbae00000bba,
+        0xbbe00000bc3,
+        0xbc600000bc9,
+        0xbca00000bce,
+        0xbd000000bd1,
+        0xbd700000bd8,
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diff --git a/idna/intranges.py b/idna/intranges.py
new file mode 100644
index 0000000..6a43b04
--- /dev/null
+++ b/idna/intranges.py
@@ -0,0 +1,54 @@
+"""
+Given a list of integers, made up of (hopefully) a small number of long runs
+of consecutive integers, compute a representation of the form
+((start1, end1), (start2, end2) ...). Then answer the question "was x present
+in the original list?" in time O(log(# runs)).
+"""
+
+import bisect
+from typing import List, Tuple
+
+def intranges_from_list(list_: List[int]) -> Tuple[int, ...]:
+    """Represent a list of integers as a sequence of ranges:
+    ((start_0, end_0), (start_1, end_1), ...), such that the original
+    integers are exactly those x such that start_i <= x < end_i for some i.
+
+    Ranges are encoded as single integers (start << 32 | end), not as tuples.
+    """
+
+    sorted_list = sorted(list_)
+    ranges = []
+    last_write = -1
+    for i in range(len(sorted_list)):
+        if i+1 < len(sorted_list):
+            if sorted_list[i] == sorted_list[i+1]-1:
+                continue
+        current_range = sorted_list[last_write+1:i+1]
+        ranges.append(_encode_range(current_range[0], current_range[-1] + 1))
+        last_write = i
+
+    return tuple(ranges)
+
+def _encode_range(start: int, end: int) -> int:
+    return (start << 32) | end
+
+def _decode_range(r: int) -> Tuple[int, int]:
+    return (r >> 32), (r & ((1 << 32) - 1))
+
+
+def intranges_contain(int_: int, ranges: Tuple[int, ...]) -> bool:
+    """Determine if `int_` falls into one of the ranges in `ranges`."""
+    tuple_ = _encode_range(int_, 0)
+    pos = bisect.bisect_left(ranges, tuple_)
+    # we could be immediately ahead of a tuple (start, end)
+    # with start < int_ <= end
+    if pos > 0:
+        left, right = _decode_range(ranges[pos-1])
+        if left <= int_ < right:
+            return True
+    # or we could be immediately behind a tuple (int_, end)
+    if pos < len(ranges):
+        left, _ = _decode_range(ranges[pos])
+        if left == int_:
+            return True
+    return False
diff --git a/idna/package_data.py b/idna/package_data.py
new file mode 100644
index 0000000..8501893
--- /dev/null
+++ b/idna/package_data.py
@@ -0,0 +1,2 @@
+__version__ = '3.4'
+
diff --git a/idna/py.typed b/idna/py.typed
new file mode 100644
index 0000000..e69de29
diff --git a/idna/uts46data.py b/idna/uts46data.py
new file mode 100644
index 0000000..186796c
--- /dev/null
+++ b/idna/uts46data.py
@@ -0,0 +1,8600 @@
+# This file is automatically generated by tools/idna-data
+# vim: set fileencoding=utf-8 :
+
+from typing import List, Tuple, Union
+
+
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+
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+    (0x2F927, 'M', '𤠔'),
+    (0x2F928, 'M', '獺'),
+    (0x2F929, 'M', '王'),
+    (0x2F92A, 'M', '㺬'),
+    (0x2F92B, 'M', '玥'),
+    (0x2F92C, 'M', '㺸'),
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+    (0x2F92F, 'M', '瑜'),
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+    (0x2F935, 'M', '𤰶'),
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+    (0x2F94B, 'M', '䁆'),
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+    (0x2F9D4, 'M', '貫'),
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+    (0x2FA1C, 'M', '鼻'),
+    (0x2FA1D, 'M', '𪘀'),
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+    (0x30000, 'V'),
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+    (0x31350, 'V'),
+    (0x323B0, 'X'),
+    (0xE0100, 'I'),
+    (0xE01F0, 'X'),
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+
+uts46data = tuple(
+    _seg_0()
+    + _seg_1()
+    + _seg_2()
+    + _seg_3()
+    + _seg_4()
+    + _seg_5()
+    + _seg_6()
+    + _seg_7()
+    + _seg_8()
+    + _seg_9()
+    + _seg_10()
+    + _seg_11()
+    + _seg_12()
+    + _seg_13()
+    + _seg_14()
+    + _seg_15()
+    + _seg_16()
+    + _seg_17()
+    + _seg_18()
+    + _seg_19()
+    + _seg_20()
+    + _seg_21()
+    + _seg_22()
+    + _seg_23()
+    + _seg_24()
+    + _seg_25()
+    + _seg_26()
+    + _seg_27()
+    + _seg_28()
+    + _seg_29()
+    + _seg_30()
+    + _seg_31()
+    + _seg_32()
+    + _seg_33()
+    + _seg_34()
+    + _seg_35()
+    + _seg_36()
+    + _seg_37()
+    + _seg_38()
+    + _seg_39()
+    + _seg_40()
+    + _seg_41()
+    + _seg_42()
+    + _seg_43()
+    + _seg_44()
+    + _seg_45()
+    + _seg_46()
+    + _seg_47()
+    + _seg_48()
+    + _seg_49()
+    + _seg_50()
+    + _seg_51()
+    + _seg_52()
+    + _seg_53()
+    + _seg_54()
+    + _seg_55()
+    + _seg_56()
+    + _seg_57()
+    + _seg_58()
+    + _seg_59()
+    + _seg_60()
+    + _seg_61()
+    + _seg_62()
+    + _seg_63()
+    + _seg_64()
+    + _seg_65()
+    + _seg_66()
+    + _seg_67()
+    + _seg_68()
+    + _seg_69()
+    + _seg_70()
+    + _seg_71()
+    + _seg_72()
+    + _seg_73()
+    + _seg_74()
+    + _seg_75()
+    + _seg_76()
+    + _seg_77()
+    + _seg_78()
+    + _seg_79()
+    + _seg_80()
+    + _seg_81()
+)  # type: Tuple[Union[Tuple[int, str], Tuple[int, str, str]], ...]
diff --git a/multidict/__init__.py b/multidict/__init__.py
new file mode 100644
index 0000000..d9ea722
--- /dev/null
+++ b/multidict/__init__.py
@@ -0,0 +1,48 @@
+"""Multidict implementation.
+
+HTTP Headers and URL query string require specific data structure:
+multidict. It behaves mostly like a dict but it can have
+several values for the same key.
+"""
+
+from ._abc import MultiMapping, MutableMultiMapping
+from ._compat import USE_EXTENSIONS
+
+__all__ = (
+    "MultiMapping",
+    "MutableMultiMapping",
+    "MultiDictProxy",
+    "CIMultiDictProxy",
+    "MultiDict",
+    "CIMultiDict",
+    "upstr",
+    "istr",
+    "getversion",
+)
+
+__version__ = "6.0.4"
+
+
+try:
+    if not USE_EXTENSIONS:
+        raise ImportError
+    from ._multidict import (
+        CIMultiDict,
+        CIMultiDictProxy,
+        MultiDict,
+        MultiDictProxy,
+        getversion,
+        istr,
+    )
+except ImportError:  # pragma: no cover
+    from ._multidict_py import (
+        CIMultiDict,
+        CIMultiDictProxy,
+        MultiDict,
+        MultiDictProxy,
+        getversion,
+        istr,
+    )
+
+
+upstr = istr
diff --git a/multidict/__init__.pyi b/multidict/__init__.pyi
new file mode 100644
index 0000000..bbc5a5c
--- /dev/null
+++ b/multidict/__init__.pyi
@@ -0,0 +1,150 @@
+import abc
+from typing import (
+    Generic,
+    Iterable,
+    Iterator,
+    Mapping,
+    MutableMapping,
+    TypeVar,
+    overload,
+)
+
+class istr(str): ...
+
+upstr = istr
+
+_S = str | istr
+
+_T = TypeVar("_T")
+
+_T_co = TypeVar("_T_co", covariant=True)
+
+_D = TypeVar("_D")
+
+class MultiMapping(Mapping[_S, _T_co]):
+    @overload
+    @abc.abstractmethod
+    def getall(self, key: _S) -> list[_T_co]: ...
+    @overload
+    @abc.abstractmethod
+    def getall(self, key: _S, default: _D) -> list[_T_co] | _D: ...
+    @overload
+    @abc.abstractmethod
+    def getone(self, key: _S) -> _T_co: ...
+    @overload
+    @abc.abstractmethod
+    def getone(self, key: _S, default: _D) -> _T_co | _D: ...
+
+_Arg = (Mapping[str, _T] | Mapping[istr, _T] | dict[str, _T]
+        | dict[istr, _T] | MultiMapping[_T]
+        | Iterable[tuple[str, _T]] | Iterable[tuple[istr, _T]])
+
+class MutableMultiMapping(MultiMapping[_T], MutableMapping[_S, _T], Generic[_T]):
+    @abc.abstractmethod
+    def add(self, key: _S, value: _T) -> None: ...
+    @abc.abstractmethod
+    def extend(self, arg: _Arg[_T] = ..., **kwargs: _T) -> None: ...
+    @overload
+    @abc.abstractmethod
+    def popone(self, key: _S) -> _T: ...
+    @overload
+    @abc.abstractmethod
+    def popone(self, key: _S, default: _D) -> _T | _D: ...
+    @overload
+    @abc.abstractmethod
+    def popall(self, key: _S) -> list[_T]: ...
+    @overload
+    @abc.abstractmethod
+    def popall(self, key: _S, default: _D) -> list[_T] | _D: ...
+
+class MultiDict(MutableMultiMapping[_T], Generic[_T]):
+    def __init__(self, arg: _Arg[_T] = ..., **kwargs: _T) -> None: ...
+    def copy(self) -> MultiDict[_T]: ...
+    def __getitem__(self, k: _S) -> _T: ...
+    def __setitem__(self, k: _S, v: _T) -> None: ...
+    def __delitem__(self, v: _S) -> None: ...
+    def __iter__(self) -> Iterator[_S]: ...
+    def __len__(self) -> int: ...
+    @overload
+    def getall(self, key: _S) -> list[_T]: ...
+    @overload
+    def getall(self, key: _S, default: _D) -> list[_T] | _D: ...
+    @overload
+    def getone(self, key: _S) -> _T: ...
+    @overload
+    def getone(self, key: _S, default: _D) -> _T | _D: ...
+    def add(self, key: _S, value: _T) -> None: ...
+    def extend(self, arg: _Arg[_T] = ..., **kwargs: _T) -> None: ...
+    @overload
+    def popone(self, key: _S) -> _T: ...
+    @overload
+    def popone(self, key: _S, default: _D) -> _T | _D: ...
+    @overload
+    def popall(self, key: _S) -> list[_T]: ...
+    @overload
+    def popall(self, key: _S, default: _D) -> list[_T] | _D: ...
+
+class CIMultiDict(MutableMultiMapping[_T], Generic[_T]):
+    def __init__(self, arg: _Arg[_T] = ..., **kwargs: _T) -> None: ...
+    def copy(self) -> CIMultiDict[_T]: ...
+    def __getitem__(self, k: _S) -> _T: ...
+    def __setitem__(self, k: _S, v: _T) -> None: ...
+    def __delitem__(self, v: _S) -> None: ...
+    def __iter__(self) -> Iterator[_S]: ...
+    def __len__(self) -> int: ...
+    @overload
+    def getall(self, key: _S) -> list[_T]: ...
+    @overload
+    def getall(self, key: _S, default: _D) -> list[_T] | _D: ...
+    @overload
+    def getone(self, key: _S) -> _T: ...
+    @overload
+    def getone(self, key: _S, default: _D) -> _T | _D: ...
+    def add(self, key: _S, value: _T) -> None: ...
+    def extend(self, arg: _Arg[_T] = ..., **kwargs: _T) -> None: ...
+    @overload
+    def popone(self, key: _S) -> _T: ...
+    @overload
+    def popone(self, key: _S, default: _D) -> _T | _D: ...
+    @overload
+    def popall(self, key: _S) -> list[_T]: ...
+    @overload
+    def popall(self, key: _S, default: _D) -> list[_T] | _D: ...
+
+class MultiDictProxy(MultiMapping[_T], Generic[_T]):
+    def __init__(
+        self, arg: MultiMapping[_T] | MutableMultiMapping[_T]
+    ) -> None: ...
+    def copy(self) -> MultiDict[_T]: ...
+    def __getitem__(self, k: _S) -> _T: ...
+    def __iter__(self) -> Iterator[_S]: ...
+    def __len__(self) -> int: ...
+    @overload
+    def getall(self, key: _S) -> list[_T]: ...
+    @overload
+    def getall(self, key: _S, default: _D) -> list[_T] | _D: ...
+    @overload
+    def getone(self, key: _S) -> _T: ...
+    @overload
+    def getone(self, key: _S, default: _D) -> _T | _D: ...
+
+class CIMultiDictProxy(MultiMapping[_T], Generic[_T]):
+    def __init__(
+        self, arg: MultiMapping[_T] | MutableMultiMapping[_T]
+    ) -> None: ...
+    def __getitem__(self, k: _S) -> _T: ...
+    def __iter__(self) -> Iterator[_S]: ...
+    def __len__(self) -> int: ...
+    @overload
+    def getall(self, key: _S) -> list[_T]: ...
+    @overload
+    def getall(self, key: _S, default: _D) -> list[_T] | _D: ...
+    @overload
+    def getone(self, key: _S) -> _T: ...
+    @overload
+    def getone(self, key: _S, default: _D) -> _T | _D: ...
+    def copy(self) -> CIMultiDict[_T]: ...
+
+def getversion(
+    md: MultiDict[_T] | CIMultiDict[_T] | MultiDictProxy[_T] | CIMultiDictProxy[_T]
+) -> int: ...
diff --git a/multidict/_abc.py b/multidict/_abc.py
new file mode 100644
index 0000000..0603cdd
--- /dev/null
+++ b/multidict/_abc.py
@@ -0,0 +1,48 @@
+import abc
+import sys
+import types
+from collections.abc import Mapping, MutableMapping
+
+
+class _TypingMeta(abc.ABCMeta):
+    # A fake metaclass to satisfy typing deps in runtime
+    # basically MultiMapping[str] and other generic-like type instantiations
+    # are emulated.
+    # Note: real type hints are provided by __init__.pyi stub file
+    if sys.version_info >= (3, 9):
+
+        def __getitem__(self, key):
+            return types.GenericAlias(self, key)
+
+    else:
+
+        def __getitem__(self, key):
+            return self
+
+
+class MultiMapping(Mapping, metaclass=_TypingMeta):
+    @abc.abstractmethod
+    def getall(self, key, default=None):
+        raise KeyError
+
+    @abc.abstractmethod
+    def getone(self, key, default=None):
+        raise KeyError
+
+
+class MutableMultiMapping(MultiMapping, MutableMapping):
+    @abc.abstractmethod
+    def add(self, key, value):
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def extend(self, *args, **kwargs):
+        raise NotImplementedError
+
+    @abc.abstractmethod
+    def popone(self, key, default=None):
+        raise KeyError
+
+    @abc.abstractmethod
+    def popall(self, key, default=None):
+        raise KeyError
diff --git a/multidict/_compat.py b/multidict/_compat.py
new file mode 100644
index 0000000..d1ff392
--- /dev/null
+++ b/multidict/_compat.py
@@ -0,0 +1,14 @@
+import os
+import platform
+
+NO_EXTENSIONS = bool(os.environ.get("MULTIDICT_NO_EXTENSIONS"))
+
+PYPY = platform.python_implementation() == "PyPy"
+
+USE_EXTENSIONS = not NO_EXTENSIONS and not PYPY
+
+if USE_EXTENSIONS:
+    try:
+        from . import _multidict  # noqa
+    except ImportError:
+        USE_EXTENSIONS = False
diff --git a/multidict/_multidict.c b/multidict/_multidict.c
new file mode 100644
index 0000000..1ba79df
--- /dev/null
+++ b/multidict/_multidict.c
@@ -0,0 +1,1824 @@
+#include "Python.h"
+#include "structmember.h"
+
+// Include order important
+#include "_multilib/defs.h"
+#include "_multilib/istr.h"
+#include "_multilib/pair_list.h"
+#include "_multilib/dict.h"
+#include "_multilib/iter.h"
+#include "_multilib/views.h"
+
+#ifndef _PyArg_UnpackKeywords
+#define FASTCALL_OLD
+#endif
+
+
+static PyObject *collections_abc_mapping;
+static PyObject *collections_abc_mut_mapping;
+static PyObject *collections_abc_mut_multi_mapping;
+
+static PyTypeObject multidict_type;
+static PyTypeObject cimultidict_type;
+static PyTypeObject multidict_proxy_type;
+static PyTypeObject cimultidict_proxy_type;
+
+static PyObject *repr_func;
+
+#define MultiDict_CheckExact(o) (Py_TYPE(o) == &multidict_type)
+#define CIMultiDict_CheckExact(o) (Py_TYPE(o) == &cimultidict_type)
+#define MultiDictProxy_CheckExact(o) (Py_TYPE(o) == &multidict_proxy_type)
+#define CIMultiDictProxy_CheckExact(o) (Py_TYPE(o) == &cimultidict_proxy_type)
+
+/* Helper macro for something like isinstance(obj, Base) */
+#define _MultiDict_Check(o)              \
+    ((MultiDict_CheckExact(o)) ||        \
+     (CIMultiDict_CheckExact(o)) ||      \
+     (MultiDictProxy_CheckExact(o)) ||   \
+     (CIMultiDictProxy_CheckExact(o)))
+
+/******************** Internal Methods ********************/
+
+/* Forward declaration */
+static PyObject *multidict_items(MultiDictObject *self);
+
+static inline PyObject *
+_multidict_getone(MultiDictObject *self, PyObject *key, PyObject *_default)
+{
+    PyObject *val = pair_list_get_one(&self->pairs, key);
+
+    if (val == NULL &&
+        PyErr_ExceptionMatches(PyExc_KeyError) &&
+        _default != NULL)
+    {
+        PyErr_Clear();
+        Py_INCREF(_default);
+        return _default;
+    }
+
+    return val;
+}
+
+static inline int
+_multidict_eq(MultiDictObject *self, MultiDictObject *other)
+{
+    Py_ssize_t pos1 = 0,
+               pos2 = 0;
+
+    Py_hash_t h1 = 0,
+              h2 = 0;
+
+    PyObject *identity1 = NULL,
+             *identity2 = NULL,
+             *value1    = NULL,
+             *value2    = NULL;
+
+    int cmp_identity = 0,
+        cmp_value    = 0;
+
+    if (self == other) {
+        return 1;
+    }
+
+    if (pair_list_len(&self->pairs) != pair_list_len(&other->pairs)) {
+        return 0;
+    }
+
+    while (_pair_list_next(&self->pairs, &pos1, &identity1, NULL, &value1, &h1) &&
+           _pair_list_next(&other->pairs, &pos2, &identity2, NULL, &value2, &h2))
+    {
+        if (h1 != h2) {
+            return 0;
+        }
+        cmp_identity = PyObject_RichCompareBool(identity1, identity2, Py_NE);
+        if (cmp_identity < 0) {
+            return -1;
+        }
+        cmp_value = PyObject_RichCompareBool(value1, value2, Py_NE);
+        if (cmp_value < 0) {
+            return -1;
+        }
+        if (cmp_identity || cmp_value) {
+            return 0;
+        }
+    }
+
+    return 1;
+}
+
+static inline int
+_multidict_update_items(MultiDictObject *self, pair_list_t *pairs)
+{
+    return pair_list_update(&self->pairs, pairs);
+}
+
+static inline int
+_multidict_append_items(MultiDictObject *self, pair_list_t *pairs)
+{
+    PyObject *key   = NULL,
+             *value = NULL;
+
+    Py_ssize_t pos = 0;
+
+    while (_pair_list_next(pairs, &pos, NULL, &key, &value, NULL)) {
+        if (pair_list_add(&self->pairs, key, value) < 0) {
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+static inline int
+_multidict_append_items_seq(MultiDictObject *self, PyObject *arg,
+                            const char *name)
+{
+    PyObject *key   = NULL,
+             *value = NULL,
+             *item  = NULL,
+             *iter  = PyObject_GetIter(arg);
+
+    if (iter == NULL) {
+        return -1;
+    }
+
+    while ((item = PyIter_Next(iter)) != NULL) {
+        if (PyTuple_CheckExact(item)) {
+            if (PyTuple_GET_SIZE(item) != 2) {
+                goto invalid_type;
+            }
+            key = PyTuple_GET_ITEM(item, 0);
+            Py_INCREF(key);
+            value = PyTuple_GET_ITEM(item, 1);
+            Py_INCREF(value);
+        }
+        else if (PyList_CheckExact(item)) {
+            if (PyList_GET_SIZE(item) != 2) {
+                goto invalid_type;
+            }
+            key = PyList_GET_ITEM(item, 0);
+            Py_INCREF(key);
+            value = PyList_GET_ITEM(item, 1);
+            Py_INCREF(value);
+        }
+        else if (PySequence_Check(item)) {
+            if (PySequence_Size(item) != 2) {
+                goto invalid_type;
+            }
+            key = PySequence_GetItem(item, 0);
+            value = PySequence_GetItem(item, 1);
+        } else {
+            goto invalid_type;
+        }
+
+        if (pair_list_add(&self->pairs, key, value) < 0) {
+            goto fail;
+        }
+        Py_CLEAR(key);
+        Py_CLEAR(value);
+        Py_CLEAR(item);
+    }
+
+    Py_DECREF(iter);
+
+    if (PyErr_Occurred()) {
+        return -1;
+    }
+
+    return 0;
+invalid_type:
+    PyErr_Format(
+        PyExc_TypeError,
+        "%s takes either dict or list of (key, value) pairs",
+        name,
+        NULL
+    );
+    goto fail;
+fail:
+    Py_XDECREF(key);
+    Py_XDECREF(value);
+    Py_XDECREF(item);
+    Py_DECREF(iter);
+    return -1;
+}
+
+static inline int
+_multidict_list_extend(PyObject *list, PyObject *target_list)
+{
+    PyObject *item = NULL,
+             *iter = PyObject_GetIter(target_list);
+
+    if (iter == NULL) {
+        return -1;
+    }
+
+    while ((item = PyIter_Next(iter)) != NULL) {
+        if (PyList_Append(list, item) < 0) {
+            Py_DECREF(item);
+            Py_DECREF(iter);
+            return -1;
+        }
+        Py_DECREF(item);
+    }
+
+    Py_DECREF(iter);
+
+    if (PyErr_Occurred()) {
+        return -1;
+    }
+
+    return 0;
+}
+
+static inline int
+_multidict_extend_with_args(MultiDictObject *self, PyObject *arg,
+                            PyObject *kwds, const char *name, int do_add)
+{
+    PyObject *arg_items  = NULL, /* tracked by GC */
+             *kwds_items = NULL; /* new reference */
+    pair_list_t *pairs = NULL;
+
+    int err = 0;
+
+    if (kwds && !PyArg_ValidateKeywordArguments(kwds)) {
+        return -1;
+    }
+
+    // TODO: mb can be refactored more clear
+    if (_MultiDict_Check(arg) && kwds == NULL) {
+        if (MultiDict_CheckExact(arg) || CIMultiDict_CheckExact(arg)) {
+            pairs = &((MultiDictObject*)arg)->pairs;
+        } else if (MultiDictProxy_CheckExact(arg) || CIMultiDictProxy_CheckExact(arg)) {
+            pairs = &((MultiDictProxyObject*)arg)->md->pairs;
+        }
+
+        if (do_add) {
+            return _multidict_append_items(self, pairs);
+        }
+
+        return _multidict_update_items(self, pairs);
+    }
+
+    if (PyObject_HasAttrString(arg, "items")) {
+        if (_MultiDict_Check(arg)) {
+            arg_items = multidict_items((MultiDictObject*)arg);
+        } else {
+            arg_items = PyMapping_Items(arg);
+        }
+        if (arg_items == NULL) {
+            return -1;
+        }
+    } else {
+        arg_items = arg;
+        Py_INCREF(arg_items);
+    }
+
+    if (kwds) {
+        PyObject *tmp = PySequence_List(arg_items);
+        Py_DECREF(arg_items);
+        arg_items = tmp;
+        if (arg_items == NULL) {
+            return -1;
+        }
+
+        kwds_items = PyDict_Items(kwds);
+        if (kwds_items == NULL) {
+            Py_DECREF(arg_items);
+            return -1;
+        }
+        err = _multidict_list_extend(arg_items, kwds_items);
+        Py_DECREF(kwds_items);
+        if (err < 0) {
+            Py_DECREF(arg_items);
+            return -1;
+        }
+    }
+
+    if (do_add) {
+        err = _multidict_append_items_seq(self, arg_items, name);
+    } else {
+        err =  pair_list_update_from_seq(&self->pairs, arg_items);
+    }
+
+    Py_DECREF(arg_items);
+
+    return err;
+}
+
+static inline int
+_multidict_extend_with_kwds(MultiDictObject *self, PyObject *kwds,
+                                 const char *name, int do_add)
+{
+    PyObject *arg = NULL;
+
+    int err = 0;
+
+    if (!PyArg_ValidateKeywordArguments(kwds)) {
+        return -1;
+    }
+
+    arg = PyDict_Items(kwds);
+    if (do_add) {
+        err = _multidict_append_items_seq(self, arg, name);
+    } else {
+        err = pair_list_update_from_seq(&self->pairs, arg);
+    }
+
+    Py_DECREF(arg);
+    return err;
+}
+
+static inline int
+_multidict_extend(MultiDictObject *self, PyObject *args, PyObject *kwds,
+                  const char *name, int do_add)
+{
+    PyObject *arg = NULL;
+
+    if (args && PyObject_Length(args) > 1)  {
+        PyErr_Format(
+            PyExc_TypeError,
+            "%s takes at most 1 positional argument (%zd given)",
+            name, PyObject_Length(args), NULL
+        );
+        return -1;
+    }
+
+    if (args && PyObject_Length(args) > 0) {
+        if (!PyArg_UnpackTuple(args, name, 0, 1, &arg)) {
+            return -1;
+        }
+        if (_multidict_extend_with_args(self, arg, kwds, name, do_add) < 0) {
+            return -1;
+        }
+    } else if (kwds && PyObject_Length(kwds) > 0) {
+        if (_multidict_extend_with_kwds(self, kwds, name, do_add) < 0) {
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+static inline PyObject *
+_multidict_copy(MultiDictObject *self, PyTypeObject *multidict_tp_object)
+{
+    MultiDictObject *new_multidict = NULL;
+
+    PyObject *arg_items = NULL,
+             *items     = NULL;
+
+    new_multidict = (MultiDictObject*)PyType_GenericNew(
+        multidict_tp_object, NULL, NULL);
+    if (new_multidict == NULL) {
+        return NULL;
+    }
+
+    if (multidict_tp_object->tp_init(
+        (PyObject*)new_multidict, NULL, NULL) < 0)
+    {
+        return NULL;
+    }
+
+    items = multidict_items(self);
+    if (items == NULL) {
+        goto fail;
+    }
+
+    // TODO: "Implementation looks as slow as possible ..."
+    arg_items = PyTuple_New(1);
+    if (arg_items == NULL) {
+        goto fail;
+    }
+
+    Py_INCREF(items);
+    PyTuple_SET_ITEM(arg_items, 0, items);
+
+    if (_multidict_extend(
+        new_multidict, arg_items, NULL, "copy", 1) < 0)
+    {
+        goto fail;
+    }
+
+    Py_DECREF(items);
+    Py_DECREF(arg_items);
+
+    return (PyObject*)new_multidict;
+
+fail:
+    Py_XDECREF(items);
+    Py_XDECREF(arg_items);
+
+    Py_DECREF(new_multidict);
+
+    return NULL;
+}
+
+static inline PyObject *
+_multidict_proxy_copy(MultiDictProxyObject *self, PyTypeObject *type)
+{
+    PyObject *new_multidict = PyType_GenericNew(type, NULL, NULL);
+    if (new_multidict == NULL) {
+        goto fail;
+    }
+    if (type->tp_init(new_multidict, NULL, NULL) < 0) {
+        goto fail;
+    }
+    if (_multidict_extend_with_args(
+        (MultiDictObject*)new_multidict, (PyObject*)self, NULL, "copy", 1) < 0)
+    {
+        goto fail;
+    }
+
+    return new_multidict;
+
+fail:
+    Py_XDECREF(new_multidict);
+    return NULL;
+}
+
+
+/******************** Base Methods ********************/
+
+static inline PyObject *
+multidict_getall(MultiDictObject *self, PyObject *const *args,
+                 Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *list     = NULL,
+             *key      = NULL,
+             *_default = NULL;
+
+    static const char * const _keywords[] = {"key", "default", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"O|O:getall", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &_default)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "getall", 0};
+    PyObject *argsbuf[2];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 1, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+
+    _default = args[1];
+skip_optional_pos:
+#endif
+    list = pair_list_get_all(&self->pairs, key);
+
+    if (list == NULL &&
+        PyErr_ExceptionMatches(PyExc_KeyError) &&
+        _default != NULL)
+    {
+        PyErr_Clear();
+        Py_INCREF(_default);
+        return _default;
+    }
+
+    return list;
+}
+
+static inline PyObject *
+multidict_getone(MultiDictObject *self, PyObject *const *args,
+                 Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *key      = NULL,
+             *_default = NULL;
+
+    static const char * const _keywords[] = {"key", "default", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"O|O:getone", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &_default)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "getone", 0};
+    PyObject *argsbuf[2];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 1, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+
+    _default = args[1];
+skip_optional_pos:
+#endif
+    return _multidict_getone(self, key, _default);
+}
+
+static inline PyObject *
+multidict_get(MultiDictObject *self, PyObject *const *args,
+                 Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *key      = NULL,
+             *_default = Py_None,
+             *ret;
+
+    static const char * const _keywords[] = {"key", "default", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"O|O:get", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &_default)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "get", 0};
+    PyObject *argsbuf[2];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 1, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+
+    _default = args[1];
+skip_optional_pos:
+#endif
+    ret = _multidict_getone(self, key, _default);
+    return ret;
+}
+
+static inline PyObject *
+multidict_keys(MultiDictObject *self)
+{
+    return multidict_keysview_new((PyObject*)self);
+}
+
+static inline PyObject *
+multidict_items(MultiDictObject *self)
+{
+    return multidict_itemsview_new((PyObject*)self);
+}
+
+static inline PyObject *
+multidict_values(MultiDictObject *self)
+{
+    return multidict_valuesview_new((PyObject*)self);
+}
+
+static inline PyObject *
+multidict_reduce(MultiDictObject *self)
+{
+    PyObject *items      = NULL,
+             *items_list = NULL,
+             *args       = NULL,
+             *result     = NULL;
+
+    items = multidict_items(self);
+    if (items == NULL) {
+        goto ret;
+    }
+
+    items_list = PySequence_List(items);
+    if (items_list == NULL) {
+        goto ret;
+    }
+
+    args = PyTuple_Pack(1, items_list);
+    if (args == NULL) {
+        goto ret;
+    }
+
+    result = PyTuple_Pack(2, Py_TYPE(self), args);
+
+ret:
+    Py_XDECREF(args);
+    Py_XDECREF(items_list);
+    Py_XDECREF(items);
+
+    return result;
+}
+
+static inline PyObject *
+multidict_repr(PyObject *self)
+{
+    return PyObject_CallFunctionObjArgs(
+        repr_func, self, NULL);
+}
+
+static inline Py_ssize_t
+multidict_mp_len(MultiDictObject *self)
+{
+    return pair_list_len(&self->pairs);
+}
+
+static inline PyObject *
+multidict_mp_subscript(MultiDictObject *self, PyObject *key)
+{
+    return _multidict_getone(self, key, NULL);
+}
+
+static inline int
+multidict_mp_as_subscript(MultiDictObject *self, PyObject *key, PyObject *val)
+{
+    if (val == NULL) {
+        return pair_list_del(&self->pairs, key);
+    } else {
+        return pair_list_replace(&self->pairs, key, val);
+    }
+}
+
+static inline int
+multidict_sq_contains(MultiDictObject *self, PyObject *key)
+{
+    return pair_list_contains(&self->pairs, key);
+}
+
+static inline PyObject *
+multidict_tp_iter(MultiDictObject *self)
+{
+    return multidict_keys_iter_new(self);
+}
+
+static inline PyObject *
+multidict_tp_richcompare(PyObject *self, PyObject *other, int op)
+{
+    // TODO: refactoring me with love
+
+    int cmp = 0;
+
+    if (op != Py_EQ && op != Py_NE) {
+        Py_RETURN_NOTIMPLEMENTED;
+    }
+
+    if (MultiDict_CheckExact(other) || CIMultiDict_CheckExact(other)) {
+        cmp = _multidict_eq(
+            (MultiDictObject*)self,
+            (MultiDictObject*)other
+        );
+        if (cmp < 0) {
+            return NULL;
+        }
+        if (op == Py_NE) {
+            cmp = !cmp;
+        }
+        return PyBool_FromLong(cmp);
+    }
+
+    if (MultiDictProxy_CheckExact(other) || CIMultiDictProxy_CheckExact(other)) {
+        cmp = _multidict_eq(
+            (MultiDictObject*)self,
+            ((MultiDictProxyObject*)other)->md
+        );
+        if (cmp < 0) {
+            return NULL;
+        }
+        if (op == Py_NE) {
+            cmp = !cmp;
+        }
+        return PyBool_FromLong(cmp);
+    }
+
+    cmp = PyObject_IsInstance(other, (PyObject*)collections_abc_mapping);
+    if (cmp < 0) {
+        return NULL;
+    }
+
+    if (cmp) {
+        cmp = pair_list_eq_to_mapping(&((MultiDictObject*)self)->pairs, other);
+        if (cmp < 0) {
+            return NULL;
+        }
+        if (op == Py_NE) {
+            cmp = !cmp;
+        }
+        return PyBool_FromLong(cmp);
+    }
+
+    Py_RETURN_NOTIMPLEMENTED;
+}
+
+static inline void
+multidict_tp_dealloc(MultiDictObject *self)
+{
+    PyObject_GC_UnTrack(self);
+    Py_TRASHCAN_SAFE_BEGIN(self);
+    if (self->weaklist != NULL) {
+        PyObject_ClearWeakRefs((PyObject *)self);
+    };
+    pair_list_dealloc(&self->pairs);
+    Py_TYPE(self)->tp_free((PyObject *)self);
+    Py_TRASHCAN_SAFE_END(self);
+}
+
+static inline int
+multidict_tp_traverse(MultiDictObject *self, visitproc visit, void *arg)
+{
+    return pair_list_traverse(&self->pairs, visit, arg);
+}
+
+static inline int
+multidict_tp_clear(MultiDictObject *self)
+{
+    return pair_list_clear(&self->pairs);
+}
+
+PyDoc_STRVAR(multidict_getall_doc,
+"Return a list of all values matching the key.");
+
+PyDoc_STRVAR(multidict_getone_doc,
+"Get first value matching the key.");
+
+PyDoc_STRVAR(multidict_get_doc,
+"Get first value matching the key.\n\nThe method is alias for .getone().");
+
+PyDoc_STRVAR(multidict_keys_doc,
+"Return a new view of the dictionary's keys.");
+
+PyDoc_STRVAR(multidict_items_doc,
+"Return a new view of the dictionary's items *(key, value) pairs).");
+
+PyDoc_STRVAR(multidict_values_doc,
+"Return a new view of the dictionary's values.");
+
+/******************** MultiDict ********************/
+
+static inline int
+multidict_tp_init(MultiDictObject *self, PyObject *args, PyObject *kwds)
+{
+    if (pair_list_init(&self->pairs) < 0) {
+        return -1;
+    }
+    if (_multidict_extend(self, args, kwds, "MultiDict", 1) < 0) {
+        return -1;
+    }
+    return 0;
+}
+
+static inline PyObject *
+multidict_add(MultiDictObject *self, PyObject *const *args,
+              Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *key = NULL,
+             *val = NULL;
+
+    static const char * const _keywords[] = {"key", "value", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"OO:add", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &val)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "add", 0};
+    PyObject *argsbuf[2];
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 2, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    val = args[1];
+#endif
+    if (pair_list_add(&self->pairs, key, val) < 0) {
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}
+
+static inline PyObject *
+multidict_copy(MultiDictObject *self)
+{
+    return _multidict_copy(self, &multidict_type);
+}
+
+static inline PyObject *
+multidict_extend(MultiDictObject *self, PyObject *args, PyObject *kwds)
+{
+    if (_multidict_extend(self, args, kwds, "extend", 1) < 0) {
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}
+
+static inline PyObject *
+multidict_clear(MultiDictObject *self)
+{
+    if (pair_list_clear(&self->pairs) < 0) {
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}
+
+static inline PyObject *
+multidict_setdefault(MultiDictObject *self, PyObject *const *args,
+                     Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *key      = NULL,
+             *_default = NULL;
+
+    static const char * const _keywords[] = {"key", "default", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"O|O:setdefault", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &_default)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "setdefault", 0};
+    PyObject *argsbuf[3];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 1, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    _default = args[1];
+
+skip_optional_pos:
+#endif
+    return pair_list_set_default(&self->pairs, key, _default);
+}
+
+static inline PyObject *
+multidict_popone(MultiDictObject *self, PyObject *const *args,
+                     Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *key      = NULL,
+             *_default = NULL,
+             *ret_val  = NULL;
+
+    static const char * const _keywords[] = {"key", "default", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"O|O:popone", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &_default)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "popone", 0};
+    PyObject *argsbuf[3];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 1, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    _default = args[1];
+
+skip_optional_pos:
+#endif
+    ret_val = pair_list_pop_one(&self->pairs, key);
+
+    if (ret_val == NULL &&
+        PyErr_ExceptionMatches(PyExc_KeyError) &&
+        _default != NULL)
+    {
+        PyErr_Clear();
+        Py_INCREF(_default);
+        return _default;
+    }
+
+    return ret_val;
+}
+
+static inline PyObject *
+multidict_pop(MultiDictObject *self, PyObject *const *args,
+                     Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *key      = NULL,
+             *_default = NULL,
+             *ret_val  = NULL;
+
+    static const char * const _keywords[] = {"key", "default", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"O|O:pop", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &_default)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "pop", 0};
+    PyObject *argsbuf[3];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 1, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    _default = args[1];
+
+skip_optional_pos:
+#endif
+    ret_val = pair_list_pop_one(&self->pairs, key);
+
+    if (ret_val == NULL &&
+        PyErr_ExceptionMatches(PyExc_KeyError) &&
+        _default != NULL)
+    {
+        PyErr_Clear();
+        Py_INCREF(_default);
+        return _default;
+    }
+
+    return ret_val;
+}
+
+static inline PyObject *
+multidict_popall(MultiDictObject *self, PyObject *const *args,
+                     Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *key      = NULL,
+             *_default = NULL,
+             *ret_val  = NULL;
+
+
+    static const char * const _keywords[] = {"key", "default", NULL};
+#ifdef FASTCALL_OLD
+    static _PyArg_Parser _parser = {"O|O:popall", _keywords, 0};
+    if (!_PyArg_ParseStackAndKeywords(args, nargs, kwnames, &_parser,
+        &key, &_default)) {
+        return NULL;
+    }
+#else
+    static _PyArg_Parser _parser = {NULL, _keywords, "popall", 0};
+    PyObject *argsbuf[3];
+    Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
+
+    args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames,
+                                 &_parser, 1, 2, 0, argsbuf);
+    if (!args) {
+        return NULL;
+    }
+    key = args[0];
+    if (!noptargs) {
+        goto skip_optional_pos;
+    }
+    _default = args[1];
+
+skip_optional_pos:
+#endif
+    ret_val = pair_list_pop_all(&self->pairs, key);
+
+    if (ret_val == NULL &&
+        PyErr_ExceptionMatches(PyExc_KeyError) &&
+        _default != NULL)
+    {
+        PyErr_Clear();
+        Py_INCREF(_default);
+        return _default;
+    }
+
+    return ret_val;
+}
+
+static inline PyObject *
+multidict_popitem(MultiDictObject *self)
+{
+    return pair_list_pop_item(&self->pairs);
+}
+
+static inline PyObject *
+multidict_update(MultiDictObject *self, PyObject *args, PyObject *kwds)
+{
+    if (_multidict_extend(self, args, kwds, "update", 0) < 0) {
+        return NULL;
+    }
+    Py_RETURN_NONE;
+}
+
+PyDoc_STRVAR(multidict_add_doc,
+"Add the key and value, not overwriting any previous value.");
+
+PyDoc_STRVAR(multidict_copy_doc,
+"Return a copy of itself.");
+
+PyDoc_STRVAR(multdicit_method_extend_doc,
+"Extend current MultiDict with more values.\n\
+This method must be used instead of update.");
+
+PyDoc_STRVAR(multidict_clear_doc,
+"Remove all items from MultiDict");
+
+PyDoc_STRVAR(multidict_setdefault_doc,
+"Return value for key, set value to default if key is not present.");
+
+PyDoc_STRVAR(multidict_popone_doc,
+"Remove the last occurrence of key and return the corresponding value.\n\n\
+If key is not found, default is returned if given, otherwise KeyError is \
+raised.\n");
+
+PyDoc_STRVAR(multidict_pop_doc,
+"Remove the last occurrence of key and return the corresponding value.\n\n\
+If key is not found, default is returned if given, otherwise KeyError is \
+raised.\n");
+
+PyDoc_STRVAR(multidict_popall_doc,
+"Remove all occurrences of key and return the list of corresponding values.\n\n\
+If key is not found, default is returned if given, otherwise KeyError is \
+raised.\n");
+
+PyDoc_STRVAR(multidict_popitem_doc,
+"Remove and return an arbitrary (key, value) pair.");
+
+PyDoc_STRVAR(multidict_update_doc,
+"Update the dictionary from *other*, overwriting existing keys.");
+
+
+#if PY_MAJOR_VERSION >= 3 && PY_MINOR_VERSION >= 9
+#define multidict_class_getitem Py_GenericAlias
+#else
+static inline PyObject *
+multidict_class_getitem(PyObject *self, PyObject *arg)
+{
+    Py_INCREF(self);
+    return self;
+}
+#endif
+
+
+PyDoc_STRVAR(sizeof__doc__,
+"D.__sizeof__() -> size of D in memory, in bytes");
+
+static inline PyObject *
+_multidict_sizeof(MultiDictObject *self)
+{
+    Py_ssize_t size = sizeof(MultiDictObject);
+    if (self->pairs.pairs != self->pairs.buffer) {
+        size += (Py_ssize_t)sizeof(pair_t) * self->pairs.capacity;
+    }
+    return PyLong_FromSsize_t(size);
+}
+
+
+static PySequenceMethods multidict_sequence = {
+    .sq_contains = (objobjproc)multidict_sq_contains,
+};
+
+static PyMappingMethods multidict_mapping = {
+    .mp_length = (lenfunc)multidict_mp_len,
+    .mp_subscript = (binaryfunc)multidict_mp_subscript,
+    .mp_ass_subscript = (objobjargproc)multidict_mp_as_subscript,
+};
+
+static PyMethodDef multidict_methods[] = {
+    {
+        "getall",
+        (PyCFunction)multidict_getall,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_getall_doc
+    },
+    {
+        "getone",
+        (PyCFunction)multidict_getone,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_getone_doc
+    },
+    {
+        "get",
+        (PyCFunction)multidict_get,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_get_doc
+    },
+    {
+        "keys",
+        (PyCFunction)multidict_keys,
+        METH_NOARGS,
+        multidict_keys_doc
+    },
+    {
+        "items",
+        (PyCFunction)multidict_items,
+        METH_NOARGS,
+        multidict_items_doc
+    },
+    {
+        "values",
+        (PyCFunction)multidict_values,
+        METH_NOARGS,
+        multidict_values_doc
+    },
+    {
+        "add",
+        (PyCFunction)multidict_add,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_add_doc
+    },
+    {
+        "copy",
+        (PyCFunction)multidict_copy,
+        METH_NOARGS,
+        multidict_copy_doc
+    },
+    {
+        "extend",
+        (PyCFunction)multidict_extend,
+        METH_VARARGS | METH_KEYWORDS,
+        multdicit_method_extend_doc
+    },
+    {
+        "clear",
+        (PyCFunction)multidict_clear,
+        METH_NOARGS,
+        multidict_clear_doc
+    },
+    {
+        "setdefault",
+        (PyCFunction)multidict_setdefault,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_setdefault_doc
+    },
+    {
+        "popone",
+        (PyCFunction)multidict_popone,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_popone_doc
+    },
+    {
+        "pop",
+        (PyCFunction)multidict_pop,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_pop_doc
+    },
+    {
+        "popall",
+        (PyCFunction)multidict_popall,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_popall_doc
+    },
+    {
+        "popitem",
+        (PyCFunction)multidict_popitem,
+        METH_NOARGS,
+        multidict_popitem_doc
+    },
+    {
+        "update",
+        (PyCFunction)multidict_update,
+        METH_VARARGS | METH_KEYWORDS,
+        multidict_update_doc
+    },
+    {
+        "__reduce__",
+        (PyCFunction)multidict_reduce,
+        METH_NOARGS,
+        NULL,
+    },
+    {
+        "__class_getitem__",
+        (PyCFunction)multidict_class_getitem,
+        METH_O | METH_CLASS,
+        NULL
+    },
+    {
+        "__sizeof__",
+        (PyCFunction)_multidict_sizeof,
+        METH_NOARGS,
+        sizeof__doc__,
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+
+PyDoc_STRVAR(MultDict_doc,
+"Dictionary with the support for duplicate keys.");
+
+
+static PyTypeObject multidict_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "multidict._multidict.MultiDict",                /* tp_name */
+    sizeof(MultiDictObject),                         /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_tp_dealloc,
+    .tp_repr = (reprfunc)multidict_repr,
+    .tp_as_sequence = &multidict_sequence,
+    .tp_as_mapping = &multidict_mapping,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    .tp_doc = MultDict_doc,
+    .tp_traverse = (traverseproc)multidict_tp_traverse,
+    .tp_clear = (inquiry)multidict_tp_clear,
+    .tp_richcompare = (richcmpfunc)multidict_tp_richcompare,
+    .tp_weaklistoffset = offsetof(MultiDictObject, weaklist),
+    .tp_iter = (getiterfunc)multidict_tp_iter,
+    .tp_methods = multidict_methods,
+    .tp_init = (initproc)multidict_tp_init,
+    .tp_alloc = PyType_GenericAlloc,
+    .tp_new = PyType_GenericNew,
+    .tp_free = PyObject_GC_Del,
+};
+
+/******************** CIMultiDict ********************/
+
+static inline int
+cimultidict_tp_init(MultiDictObject *self, PyObject *args, PyObject *kwds)
+{
+    if (ci_pair_list_init(&self->pairs) < 0) {
+        return -1;
+    }
+    if (_multidict_extend(self, args, kwds, "CIMultiDict", 1) < 0) {
+        return -1;
+    }
+    return 0;
+}
+
+static inline PyObject *
+cimultidict_copy(MultiDictObject *self)
+{
+    return _multidict_copy(self, &cimultidict_type);
+}
+
+PyDoc_STRVAR(cimultidict_copy_doc,
+"Return a copy of itself.");
+
+static PyMethodDef cimultidict_methods[] = {
+    {
+        "copy",
+        (PyCFunction)cimultidict_copy,
+        METH_NOARGS,
+        cimultidict_copy_doc
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+PyDoc_STRVAR(CIMultDict_doc,
+"Dictionary with the support for duplicate case-insensitive keys.");
+
+
+static PyTypeObject cimultidict_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "multidict._multidict.CIMultiDict",              /* tp_name */
+    sizeof(MultiDictObject),                         /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_tp_dealloc,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    .tp_doc = CIMultDict_doc,
+    .tp_traverse = (traverseproc)multidict_tp_traverse,
+    .tp_clear = (inquiry)multidict_tp_clear,
+    .tp_weaklistoffset = offsetof(MultiDictObject, weaklist),
+    .tp_methods = cimultidict_methods,
+    .tp_base = &multidict_type,
+    .tp_init = (initproc)cimultidict_tp_init,
+    .tp_alloc = PyType_GenericAlloc,
+    .tp_new = PyType_GenericNew,
+    .tp_free = PyObject_GC_Del,
+};
+
+/******************** MultiDictProxy ********************/
+
+static inline int
+multidict_proxy_tp_init(MultiDictProxyObject *self, PyObject *args,
+                        PyObject *kwds)
+{
+    PyObject        *arg = NULL;
+    MultiDictObject *md  = NULL;
+
+    if (!PyArg_UnpackTuple(args, "multidict._multidict.MultiDictProxy",
+                           0, 1, &arg))
+    {
+        return -1;
+    }
+    if (arg == NULL) {
+        PyErr_Format(
+            PyExc_TypeError,
+            "__init__() missing 1 required positional argument: 'arg'"
+        );
+        return -1;
+    }
+    if (!MultiDictProxy_CheckExact(arg) &&
+        !CIMultiDict_CheckExact(arg) &&
+        !MultiDict_CheckExact(arg))
+    {
+        PyErr_Format(
+            PyExc_TypeError,
+            "ctor requires MultiDict or MultiDictProxy instance, "
+            "not <class '%s'>",
+            Py_TYPE(arg)->tp_name
+        );
+        return -1;
+    }
+
+    md = (MultiDictObject*)arg;
+    if (MultiDictProxy_CheckExact(arg)) {
+        md = ((MultiDictProxyObject*)arg)->md;
+    }
+    Py_INCREF(md);
+    self->md = md;
+
+    return 0;
+}
+
+static inline PyObject *
+multidict_proxy_getall(MultiDictProxyObject *self, PyObject *const *args,
+                       Py_ssize_t nargs, PyObject *kwnames)
+{
+    return multidict_getall(self->md, args, nargs, kwnames);
+}
+
+static inline PyObject *
+multidict_proxy_getone(MultiDictProxyObject *self, PyObject *const *args,
+                       Py_ssize_t nargs, PyObject *kwnames)
+{
+    return multidict_getone(self->md, args, nargs, kwnames);
+}
+
+static inline PyObject *
+multidict_proxy_get(MultiDictProxyObject *self, PyObject *const *args,
+                       Py_ssize_t nargs, PyObject *kwnames)
+{
+    return multidict_get(self->md, args, nargs, kwnames);
+}
+
+static inline PyObject *
+multidict_proxy_keys(MultiDictProxyObject *self)
+{
+    return multidict_keys(self->md);
+}
+
+static inline PyObject *
+multidict_proxy_items(MultiDictProxyObject *self)
+{
+    return multidict_items(self->md);
+}
+
+static inline PyObject *
+multidict_proxy_values(MultiDictProxyObject *self)
+{
+    return multidict_values(self->md);
+}
+
+static inline PyObject *
+multidict_proxy_copy(MultiDictProxyObject *self)
+{
+    return _multidict_proxy_copy(self, &multidict_type);
+}
+
+static inline PyObject *
+multidict_proxy_reduce(MultiDictProxyObject *self)
+{
+    PyErr_Format(
+        PyExc_TypeError,
+        "can't pickle %s objects", Py_TYPE(self)->tp_name
+    );
+
+    return NULL;
+}
+
+static inline Py_ssize_t
+multidict_proxy_mp_len(MultiDictProxyObject *self)
+{
+    return multidict_mp_len(self->md);
+}
+
+static inline PyObject *
+multidict_proxy_mp_subscript(MultiDictProxyObject *self, PyObject *key)
+{
+    return multidict_mp_subscript(self->md, key);
+}
+
+static inline int
+multidict_proxy_sq_contains(MultiDictProxyObject *self, PyObject *key)
+{
+    return multidict_sq_contains(self->md, key);
+}
+
+static inline PyObject *
+multidict_proxy_tp_iter(MultiDictProxyObject *self)
+{
+    return multidict_tp_iter(self->md);
+}
+
+static inline PyObject *
+multidict_proxy_tp_richcompare(MultiDictProxyObject *self, PyObject *other,
+                               int op)
+{
+    return multidict_tp_richcompare((PyObject*)self->md, other, op);
+}
+
+static inline void
+multidict_proxy_tp_dealloc(MultiDictProxyObject *self)
+{
+    PyObject_GC_UnTrack(self);
+    if (self->weaklist != NULL) {
+        PyObject_ClearWeakRefs((PyObject *)self);
+    };
+    Py_XDECREF(self->md);
+    Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static inline int
+multidict_proxy_tp_traverse(MultiDictProxyObject *self, visitproc visit,
+                            void *arg)
+{
+    Py_VISIT(self->md);
+    return 0;
+}
+
+static inline int
+multidict_proxy_tp_clear(MultiDictProxyObject *self)
+{
+    Py_CLEAR(self->md);
+    return 0;
+}
+
+static PySequenceMethods multidict_proxy_sequence = {
+    .sq_contains = (objobjproc)multidict_proxy_sq_contains,
+};
+
+static PyMappingMethods multidict_proxy_mapping = {
+    .mp_length = (lenfunc)multidict_proxy_mp_len,
+    .mp_subscript = (binaryfunc)multidict_proxy_mp_subscript,
+};
+
+static PyMethodDef multidict_proxy_methods[] = {
+    {
+        "getall",
+        (PyCFunction)multidict_proxy_getall,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_getall_doc
+    },
+    {
+        "getone",
+        (PyCFunction)multidict_proxy_getone,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_getone_doc
+    },
+    {
+        "get",
+        (PyCFunction)multidict_proxy_get,
+        METH_FASTCALL | METH_KEYWORDS,
+        multidict_get_doc
+    },
+    {
+        "keys",
+        (PyCFunction)multidict_proxy_keys,
+        METH_NOARGS,
+        multidict_keys_doc
+    },
+    {
+        "items",
+        (PyCFunction)multidict_proxy_items,
+        METH_NOARGS,
+        multidict_items_doc
+    },
+    {
+        "values",
+        (PyCFunction)multidict_proxy_values,
+        METH_NOARGS,
+        multidict_values_doc
+    },
+    {
+        "copy",
+        (PyCFunction)multidict_proxy_copy,
+        METH_NOARGS,
+        multidict_copy_doc
+    },
+    {
+        "__reduce__",
+        (PyCFunction)multidict_proxy_reduce,
+        METH_NOARGS,
+        NULL
+    },
+    {
+        "__class_getitem__",
+        (PyCFunction)multidict_class_getitem,
+        METH_O | METH_CLASS,
+        NULL
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+
+PyDoc_STRVAR(MultDictProxy_doc,
+"Read-only proxy for MultiDict instance.");
+
+
+static PyTypeObject multidict_proxy_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "multidict._multidict.MultiDictProxy",           /* tp_name */
+    sizeof(MultiDictProxyObject),                    /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_proxy_tp_dealloc,
+    .tp_repr = (reprfunc)multidict_repr,
+    .tp_as_sequence = &multidict_proxy_sequence,
+    .tp_as_mapping = &multidict_proxy_mapping,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    .tp_doc = MultDictProxy_doc,
+    .tp_traverse = (traverseproc)multidict_proxy_tp_traverse,
+    .tp_clear = (inquiry)multidict_proxy_tp_clear,
+    .tp_richcompare = (richcmpfunc)multidict_proxy_tp_richcompare,
+    .tp_weaklistoffset = offsetof(MultiDictProxyObject, weaklist),
+    .tp_iter = (getiterfunc)multidict_proxy_tp_iter,
+    .tp_methods = multidict_proxy_methods,
+    .tp_init = (initproc)multidict_proxy_tp_init,
+    .tp_alloc = PyType_GenericAlloc,
+    .tp_new = PyType_GenericNew,
+    .tp_free = PyObject_GC_Del,
+};
+
+/******************** CIMultiDictProxy ********************/
+
+static inline int
+cimultidict_proxy_tp_init(MultiDictProxyObject *self, PyObject *args,
+                          PyObject *kwds)
+{
+    PyObject        *arg = NULL;
+    MultiDictObject *md  = NULL;
+
+    if (!PyArg_UnpackTuple(args, "multidict._multidict.CIMultiDictProxy",
+                           1, 1, &arg))
+    {
+        return -1;
+    }
+    if (arg == NULL) {
+        PyErr_Format(
+            PyExc_TypeError,
+            "__init__() missing 1 required positional argument: 'arg'"
+        );
+        return -1;
+    }
+    if (!CIMultiDictProxy_CheckExact(arg) && !CIMultiDict_CheckExact(arg)) {
+        PyErr_Format(
+            PyExc_TypeError,
+            "ctor requires CIMultiDict or CIMultiDictProxy instance, "
+            "not <class '%s'>",
+            Py_TYPE(arg)->tp_name
+        );
+        return -1;
+    }
+
+    md = (MultiDictObject*)arg;
+    if (CIMultiDictProxy_CheckExact(arg)) {
+        md = ((MultiDictProxyObject*)arg)->md;
+    }
+    Py_INCREF(md);
+    self->md = md;
+
+    return 0;
+}
+
+static inline PyObject *
+cimultidict_proxy_copy(MultiDictProxyObject *self)
+{
+    return _multidict_proxy_copy(self, &cimultidict_type);
+}
+
+
+PyDoc_STRVAR(CIMultDictProxy_doc,
+"Read-only proxy for CIMultiDict instance.");
+
+PyDoc_STRVAR(cimultidict_proxy_copy_doc,
+"Return copy of itself");
+
+static PyMethodDef cimultidict_proxy_methods[] = {
+    {
+        "copy",
+        (PyCFunction)cimultidict_proxy_copy,
+        METH_NOARGS,
+        cimultidict_proxy_copy_doc
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+static PyTypeObject cimultidict_proxy_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "multidict._multidict.CIMultiDictProxy",         /* tp_name */
+    sizeof(MultiDictProxyObject),                    /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_proxy_tp_dealloc,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    .tp_doc = CIMultDictProxy_doc,
+    .tp_traverse = (traverseproc)multidict_proxy_tp_traverse,
+    .tp_clear = (inquiry)multidict_proxy_tp_clear,
+    .tp_richcompare = (richcmpfunc)multidict_proxy_tp_richcompare,
+    .tp_weaklistoffset = offsetof(MultiDictProxyObject, weaklist),
+    .tp_methods = cimultidict_proxy_methods,
+    .tp_base = &multidict_proxy_type,
+    .tp_init = (initproc)cimultidict_proxy_tp_init,
+    .tp_alloc = PyType_GenericAlloc,
+    .tp_new = PyType_GenericNew,
+    .tp_free = PyObject_GC_Del,
+};
+
+/******************** Other functions ********************/
+
+static inline PyObject *
+getversion(PyObject *self, PyObject *md)
+{
+    pair_list_t *pairs = NULL;
+    if (MultiDict_CheckExact(md) || CIMultiDict_CheckExact(md)) {
+        pairs = &((MultiDictObject*)md)->pairs;
+    } else if (MultiDictProxy_CheckExact(md) || CIMultiDictProxy_CheckExact(md)) {
+        pairs = &((MultiDictProxyObject*)md)->md->pairs;
+    } else {
+        PyErr_Format(PyExc_TypeError, "unexpected type");
+        return NULL;
+    }
+    return PyLong_FromUnsignedLong(pair_list_version(pairs));
+}
+
+/******************** Module ********************/
+
+static inline void
+module_free(void *m)
+{
+    Py_CLEAR(collections_abc_mapping);
+    Py_CLEAR(collections_abc_mut_mapping);
+    Py_CLEAR(collections_abc_mut_multi_mapping);
+}
+
+static PyMethodDef multidict_module_methods[] = {
+    {
+        "getversion",
+        (PyCFunction)getversion,
+        METH_O
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+static PyModuleDef multidict_module = {
+    PyModuleDef_HEAD_INIT,      /* m_base */
+    "_multidict",               /* m_name */
+    .m_size = -1,
+    .m_methods = multidict_module_methods,
+    .m_free = (freefunc)module_free,
+};
+
+PyMODINIT_FUNC
+PyInit__multidict()
+{
+    PyObject *module = NULL,
+             *reg_func_call_result = NULL;
+
+#define WITH_MOD(NAME)                      \
+    Py_CLEAR(module);                       \
+    module = PyImport_ImportModule(NAME);   \
+    if (module == NULL) {                   \
+        goto fail;                          \
+    }
+
+#define GET_MOD_ATTR(VAR, NAME)                 \
+    VAR = PyObject_GetAttrString(module, NAME); \
+    if (VAR == NULL) {                          \
+        goto fail;                              \
+    }
+
+    if (multidict_views_init() < 0) {
+        goto fail;
+    }
+
+    if (multidict_iter_init() < 0) {
+        goto fail;
+    }
+
+    if (istr_init() < 0) {
+        goto fail;
+    }
+
+    if (PyType_Ready(&multidict_type) < 0 ||
+        PyType_Ready(&cimultidict_type) < 0 ||
+        PyType_Ready(&multidict_proxy_type) < 0 ||
+        PyType_Ready(&cimultidict_proxy_type) < 0)
+    {
+        goto fail;
+    }
+
+    WITH_MOD("collections.abc");
+    GET_MOD_ATTR(collections_abc_mapping, "Mapping");
+
+    WITH_MOD("multidict._abc");
+    GET_MOD_ATTR(collections_abc_mut_mapping, "MultiMapping");
+
+    WITH_MOD("multidict._abc");
+    GET_MOD_ATTR(collections_abc_mut_multi_mapping, "MutableMultiMapping");
+
+    WITH_MOD("multidict._multidict_base");
+    GET_MOD_ATTR(repr_func, "_mdrepr");
+
+    /* Register in _abc mappings (CI)MultiDict and (CI)MultiDictProxy */
+    reg_func_call_result = PyObject_CallMethod(
+        collections_abc_mut_mapping,
+        "register", "O",
+        (PyObject*)&multidict_proxy_type
+    );
+    if (reg_func_call_result == NULL) {
+        goto fail;
+    }
+    Py_DECREF(reg_func_call_result);
+
+    reg_func_call_result = PyObject_CallMethod(
+        collections_abc_mut_mapping,
+        "register", "O",
+        (PyObject*)&cimultidict_proxy_type
+    );
+    if (reg_func_call_result == NULL) {
+        goto fail;
+    }
+    Py_DECREF(reg_func_call_result);
+
+    reg_func_call_result = PyObject_CallMethod(
+        collections_abc_mut_multi_mapping,
+        "register", "O",
+        (PyObject*)&multidict_type
+    );
+    if (reg_func_call_result == NULL) {
+        goto fail;
+    }
+    Py_DECREF(reg_func_call_result);
+
+    reg_func_call_result = PyObject_CallMethod(
+        collections_abc_mut_multi_mapping,
+        "register", "O",
+        (PyObject*)&cimultidict_type
+    );
+    if (reg_func_call_result == NULL) {
+        goto fail;
+    }
+    Py_DECREF(reg_func_call_result);
+
+    /* Instantiate this module */
+    module = PyModule_Create(&multidict_module);
+
+    Py_INCREF(&istr_type);
+    if (PyModule_AddObject(
+            module, "istr", (PyObject*)&istr_type) < 0)
+    {
+        goto fail;
+    }
+
+    Py_INCREF(&multidict_type);
+    if (PyModule_AddObject(
+            module, "MultiDict", (PyObject*)&multidict_type) < 0)
+    {
+        goto fail;
+    }
+
+    Py_INCREF(&cimultidict_type);
+    if (PyModule_AddObject(
+            module, "CIMultiDict", (PyObject*)&cimultidict_type) < 0)
+    {
+        goto fail;
+    }
+
+    Py_INCREF(&multidict_proxy_type);
+    if (PyModule_AddObject(
+            module, "MultiDictProxy", (PyObject*)&multidict_proxy_type) < 0)
+    {
+        goto fail;
+    }
+
+    Py_INCREF(&cimultidict_proxy_type);
+    if (PyModule_AddObject(
+            module, "CIMultiDictProxy", (PyObject*)&cimultidict_proxy_type) < 0)
+    {
+        goto fail;
+    }
+
+    return module;
+
+fail:
+    Py_XDECREF(collections_abc_mapping);
+    Py_XDECREF(collections_abc_mut_mapping);
+    Py_XDECREF(collections_abc_mut_multi_mapping);
+
+    return NULL;
+
+#undef WITH_MOD
+#undef GET_MOD_ATTR
+}
diff --git a/multidict/_multidict_base.py b/multidict/_multidict_base.py
new file mode 100644
index 0000000..3944665
--- /dev/null
+++ b/multidict/_multidict_base.py
@@ -0,0 +1,144 @@
+from collections.abc import ItemsView, Iterable, KeysView, Set, ValuesView
+
+
+def _abc_itemsview_register(view_cls):
+    ItemsView.register(view_cls)
+
+
+def _abc_keysview_register(view_cls):
+    KeysView.register(view_cls)
+
+
+def _abc_valuesview_register(view_cls):
+    ValuesView.register(view_cls)
+
+
+def _viewbaseset_richcmp(view, other, op):
+    if op == 0:  # <
+        if not isinstance(other, Set):
+            return NotImplemented
+        return len(view) < len(other) and view <= other
+    elif op == 1:  # <=
+        if not isinstance(other, Set):
+            return NotImplemented
+        if len(view) > len(other):
+            return False
+        for elem in view:
+            if elem not in other:
+                return False
+        return True
+    elif op == 2:  # ==
+        if not isinstance(other, Set):
+            return NotImplemented
+        return len(view) == len(other) and view <= other
+    elif op == 3:  # !=
+        return not view == other
+    elif op == 4:  # >
+        if not isinstance(other, Set):
+            return NotImplemented
+        return len(view) > len(other) and view >= other
+    elif op == 5:  # >=
+        if not isinstance(other, Set):
+            return NotImplemented
+        if len(view) < len(other):
+            return False
+        for elem in other:
+            if elem not in view:
+                return False
+        return True
+
+
+def _viewbaseset_and(view, other):
+    if not isinstance(other, Iterable):
+        return NotImplemented
+    if isinstance(view, Set):
+        view = set(iter(view))
+    if isinstance(other, Set):
+        other = set(iter(other))
+    if not isinstance(other, Set):
+        other = set(iter(other))
+    return view & other
+
+
+def _viewbaseset_or(view, other):
+    if not isinstance(other, Iterable):
+        return NotImplemented
+    if isinstance(view, Set):
+        view = set(iter(view))
+    if isinstance(other, Set):
+        other = set(iter(other))
+    if not isinstance(other, Set):
+        other = set(iter(other))
+    return view | other
+
+
+def _viewbaseset_sub(view, other):
+    if not isinstance(other, Iterable):
+        return NotImplemented
+    if isinstance(view, Set):
+        view = set(iter(view))
+    if isinstance(other, Set):
+        other = set(iter(other))
+    if not isinstance(other, Set):
+        other = set(iter(other))
+    return view - other
+
+
+def _viewbaseset_xor(view, other):
+    if not isinstance(other, Iterable):
+        return NotImplemented
+    if isinstance(view, Set):
+        view = set(iter(view))
+    if isinstance(other, Set):
+        other = set(iter(other))
+    if not isinstance(other, Set):
+        other = set(iter(other))
+    return view ^ other
+
+
+def _itemsview_isdisjoint(view, other):
+    "Return True if two sets have a null intersection."
+    for v in other:
+        if v in view:
+            return False
+    return True
+
+
+def _itemsview_repr(view):
+    lst = []
+    for k, v in view:
+        lst.append("{!r}: {!r}".format(k, v))
+    body = ", ".join(lst)
+    return "{}({})".format(view.__class__.__name__, body)
+
+
+def _keysview_isdisjoint(view, other):
+    "Return True if two sets have a null intersection."
+    for k in other:
+        if k in view:
+            return False
+    return True
+
+
+def _keysview_repr(view):
+    lst = []
+    for k in view:
+        lst.append("{!r}".format(k))
+    body = ", ".join(lst)
+    return "{}({})".format(view.__class__.__name__, body)
+
+
+def _valuesview_repr(view):
+    lst = []
+    for v in view:
+        lst.append("{!r}".format(v))
+    body = ", ".join(lst)
+    return "{}({})".format(view.__class__.__name__, body)
+
+
+def _mdrepr(md):
+    lst = []
+    for k, v in md.items():
+        lst.append("'{}': {!r}".format(k, v))
+    body = ", ".join(lst)
+    return "<{}({})>".format(md.__class__.__name__, body)
diff --git a/multidict/_multidict_py.py b/multidict/_multidict_py.py
new file mode 100644
index 0000000..cdbc328
--- /dev/null
+++ b/multidict/_multidict_py.py
@@ -0,0 +1,526 @@
+import sys
+import types
+from array import array
+from collections import abc
+
+from ._abc import MultiMapping, MutableMultiMapping
+
+_marker = object()
+
+if sys.version_info >= (3, 9):
+    GenericAlias = types.GenericAlias
+else:
+    def GenericAlias(cls):
+        return cls
+
+
+class istr(str):
+
+    """Case insensitive str."""
+
+    __is_istr__ = True
+
+
+upstr = istr  # for relaxing backward compatibility problems
+
+
+def getversion(md):
+    if not isinstance(md, _Base):
+        raise TypeError("Parameter should be multidict or proxy")
+    return md._impl._version
+
+
+_version = array("Q", [0])
+
+
+class _Impl:
+    __slots__ = ("_items", "_version")
+
+    def __init__(self):
+        self._items = []
+        self.incr_version()
+
+    def incr_version(self):
+        global _version
+        v = _version
+        v[0] += 1
+        self._version = v[0]
+
+    if sys.implementation.name != "pypy":
+
+        def __sizeof__(self):
+            return object.__sizeof__(self) + sys.getsizeof(self._items)
+
+
+class _Base:
+    def _title(self, key):
+        return key
+
+    def getall(self, key, default=_marker):
+        """Return a list of all values matching the key."""
+        identity = self._title(key)
+        res = [v for i, k, v in self._impl._items if i == identity]
+        if res:
+            return res
+        if not res and default is not _marker:
+            return default
+        raise KeyError("Key not found: %r" % key)
+
+    def getone(self, key, default=_marker):
+        """Get first value matching the key.
+
+        Raises KeyError if the key is not found and no default is provided.
+        """
+        identity = self._title(key)
+        for i, k, v in self._impl._items:
+            if i == identity:
+                return v
+        if default is not _marker:
+            return default
+        raise KeyError("Key not found: %r" % key)
+
+    # Mapping interface #
+
+    def __getitem__(self, key):
+        return self.getone(key)
+
+    def get(self, key, default=None):
+        """Get first value matching the key.
+
+        If the key is not found, returns the default (or None if no default is provided)
+        """
+        return self.getone(key, default)
+
+    def __iter__(self):
+        return iter(self.keys())
+
+    def __len__(self):
+        return len(self._impl._items)
+
+    def keys(self):
+        """Return a new view of the dictionary's keys."""
+        return _KeysView(self._impl)
+
+    def items(self):
+        """Return a new view of the dictionary's items *(key, value) pairs)."""
+        return _ItemsView(self._impl)
+
+    def values(self):
+        """Return a new view of the dictionary's values."""
+        return _ValuesView(self._impl)
+
+    def __eq__(self, other):
+        if not isinstance(other, abc.Mapping):
+            return NotImplemented
+        if isinstance(other, _Base):
+            lft = self._impl._items
+            rht = other._impl._items
+            if len(lft) != len(rht):
+                return False
+            for (i1, k2, v1), (i2, k2, v2) in zip(lft, rht):
+                if i1 != i2 or v1 != v2:
+                    return False
+            return True
+        if len(self._impl._items) != len(other):
+            return False
+        for k, v in self.items():
+            nv = other.get(k, _marker)
+            if v != nv:
+                return False
+        return True
+
+    def __contains__(self, key):
+        identity = self._title(key)
+        for i, k, v in self._impl._items:
+            if i == identity:
+                return True
+        return False
+
+    def __repr__(self):
+        body = ", ".join("'{}': {!r}".format(k, v) for k, v in self.items())
+        return "<{}({})>".format(self.__class__.__name__, body)
+
+    __class_getitem__ = classmethod(GenericAlias)
+
+
+class MultiDictProxy(_Base, MultiMapping):
+    """Read-only proxy for MultiDict instance."""
+
+    def __init__(self, arg):
+        if not isinstance(arg, (MultiDict, MultiDictProxy)):
+            raise TypeError(
+                "ctor requires MultiDict or MultiDictProxy instance"
+                ", not {}".format(type(arg))
+            )
+
+        self._impl = arg._impl
+
+    def __reduce__(self):
+        raise TypeError("can't pickle {} objects".format(self.__class__.__name__))
+
+    def copy(self):
+        """Return a copy of itself."""
+        return MultiDict(self.items())
+
+
+class CIMultiDictProxy(MultiDictProxy):
+    """Read-only proxy for CIMultiDict instance."""
+
+    def __init__(self, arg):
+        if not isinstance(arg, (CIMultiDict, CIMultiDictProxy)):
+            raise TypeError(
+                "ctor requires CIMultiDict or CIMultiDictProxy instance"
+                ", not {}".format(type(arg))
+            )
+
+        self._impl = arg._impl
+
+    def _title(self, key):
+        return key.title()
+
+    def copy(self):
+        """Return a copy of itself."""
+        return CIMultiDict(self.items())
+
+
+class MultiDict(_Base, MutableMultiMapping):
+    """Dictionary with the support for duplicate keys."""
+
+    def __init__(self, *args, **kwargs):
+        self._impl = _Impl()
+
+        self._extend(args, kwargs, self.__class__.__name__, self._extend_items)
+
+    if sys.implementation.name != "pypy":
+
+        def __sizeof__(self):
+            return object.__sizeof__(self) + sys.getsizeof(self._impl)
+
+    def __reduce__(self):
+        return (self.__class__, (list(self.items()),))
+
+    def _title(self, key):
+        return key
+
+    def _key(self, key):
+        if isinstance(key, str):
+            return key
+        else:
+            raise TypeError(
+                "MultiDict keys should be either str " "or subclasses of str"
+            )
+
+    def add(self, key, value):
+        identity = self._title(key)
+        self._impl._items.append((identity, self._key(key), value))
+        self._impl.incr_version()
+
+    def copy(self):
+        """Return a copy of itself."""
+        cls = self.__class__
+        return cls(self.items())
+
+    __copy__ = copy
+
+    def extend(self, *args, **kwargs):
+        """Extend current MultiDict with more values.
+
+        This method must be used instead of update.
+        """
+        self._extend(args, kwargs, "extend", self._extend_items)
+
+    def _extend(self, args, kwargs, name, method):
+        if len(args) > 1:
+            raise TypeError(
+                "{} takes at most 1 positional argument"
+                " ({} given)".format(name, len(args))
+            )
+        if args:
+            arg = args[0]
+            if isinstance(args[0], (MultiDict, MultiDictProxy)) and not kwargs:
+                items = arg._impl._items
+            else:
+                if hasattr(arg, "items"):
+                    arg = arg.items()
+                if kwargs:
+                    arg = list(arg)
+                    arg.extend(list(kwargs.items()))
+                items = []
+                for item in arg:
+                    if not len(item) == 2:
+                        raise TypeError(
+                            "{} takes either dict or list of (key, value) "
+                            "tuples".format(name)
+                        )
+                    items.append((self._title(item[0]), self._key(item[0]), item[1]))
+
+            method(items)
+        else:
+            method(
+                [
+                    (self._title(key), self._key(key), value)
+                    for key, value in kwargs.items()
+                ]
+            )
+
+    def _extend_items(self, items):
+        for identity, key, value in items:
+            self.add(key, value)
+
+    def clear(self):
+        """Remove all items from MultiDict."""
+        self._impl._items.clear()
+        self._impl.incr_version()
+
+    # Mapping interface #
+
+    def __setitem__(self, key, value):
+        self._replace(key, value)
+
+    def __delitem__(self, key):
+        identity = self._title(key)
+        items = self._impl._items
+        found = False
+        for i in range(len(items) - 1, -1, -1):
+            if items[i][0] == identity:
+                del items[i]
+                found = True
+        if not found:
+            raise KeyError(key)
+        else:
+            self._impl.incr_version()
+
+    def setdefault(self, key, default=None):
+        """Return value for key, set value to default if key is not present."""
+        identity = self._title(key)
+        for i, k, v in self._impl._items:
+            if i == identity:
+                return v
+        self.add(key, default)
+        return default
+
+    def popone(self, key, default=_marker):
+        """Remove specified key and return the corresponding value.
+
+        If key is not found, d is returned if given, otherwise
+        KeyError is raised.
+
+        """
+        identity = self._title(key)
+        for i in range(len(self._impl._items)):
+            if self._impl._items[i][0] == identity:
+                value = self._impl._items[i][2]
+                del self._impl._items[i]
+                self._impl.incr_version()
+                return value
+        if default is _marker:
+            raise KeyError(key)
+        else:
+            return default
+
+    pop = popone  # type: ignore
+
+    def popall(self, key, default=_marker):
+        """Remove all occurrences of key and return the list of corresponding
+        values.
+
+        If key is not found, default is returned if given, otherwise
+        KeyError is raised.
+
+        """
+        found = False
+        identity = self._title(key)
+        ret = []
+        for i in range(len(self._impl._items) - 1, -1, -1):
+            item = self._impl._items[i]
+            if item[0] == identity:
+                ret.append(item[2])
+                del self._impl._items[i]
+                self._impl.incr_version()
+                found = True
+        if not found:
+            if default is _marker:
+                raise KeyError(key)
+            else:
+                return default
+        else:
+            ret.reverse()
+            return ret
+
+    def popitem(self):
+        """Remove and return an arbitrary (key, value) pair."""
+        if self._impl._items:
+            i = self._impl._items.pop(0)
+            self._impl.incr_version()
+            return i[1], i[2]
+        else:
+            raise KeyError("empty multidict")
+
+    def update(self, *args, **kwargs):
+        """Update the dictionary from *other*, overwriting existing keys."""
+        self._extend(args, kwargs, "update", self._update_items)
+
+    def _update_items(self, items):
+        if not items:
+            return
+        used_keys = {}
+        for identity, key, value in items:
+            start = used_keys.get(identity, 0)
+            for i in range(start, len(self._impl._items)):
+                item = self._impl._items[i]
+                if item[0] == identity:
+                    used_keys[identity] = i + 1
+                    self._impl._items[i] = (identity, key, value)
+                    break
+            else:
+                self._impl._items.append((identity, key, value))
+                used_keys[identity] = len(self._impl._items)
+
+        # drop tails
+        i = 0
+        while i < len(self._impl._items):
+            item = self._impl._items[i]
+            identity = item[0]
+            pos = used_keys.get(identity)
+            if pos is None:
+                i += 1
+                continue
+            if i >= pos:
+                del self._impl._items[i]
+            else:
+                i += 1
+
+        self._impl.incr_version()
+
+    def _replace(self, key, value):
+        key = self._key(key)
+        identity = self._title(key)
+        items = self._impl._items
+
+        for i in range(len(items)):
+            item = items[i]
+            if item[0] == identity:
+                items[i] = (identity, key, value)
+                # i points to last found item
+                rgt = i
+                self._impl.incr_version()
+                break
+        else:
+            self._impl._items.append((identity, key, value))
+            self._impl.incr_version()
+            return
+
+        # remove all tail items
+        i = rgt + 1
+        while i < len(items):
+            item = items[i]
+            if item[0] == identity:
+                del items[i]
+            else:
+                i += 1
+
+
+class CIMultiDict(MultiDict):
+    """Dictionary with the support for duplicate case-insensitive keys."""
+
+    def _title(self, key):
+        return key.title()
+
+
+class _Iter:
+    __slots__ = ("_size", "_iter")
+
+    def __init__(self, size, iterator):
+        self._size = size
+        self._iter = iterator
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return next(self._iter)
+
+    def __length_hint__(self):
+        return self._size
+
+
+class _ViewBase:
+    def __init__(self, impl):
+        self._impl = impl
+
+    def __len__(self):
+        return len(self._impl._items)
+
+
+class _ItemsView(_ViewBase, abc.ItemsView):
+    def __contains__(self, item):
+        assert isinstance(item, tuple) or isinstance(item, list)
+        assert len(item) == 2
+        for i, k, v in self._impl._items:
+            if item[0] == k and item[1] == v:
+                return True
+        return False
+
+    def __iter__(self):
+        return _Iter(len(self), self._iter(self._impl._version))
+
+    def _iter(self, version):
+        for i, k, v in self._impl._items:
+            if version != self._impl._version:
+                raise RuntimeError("Dictionary changed during iteration")
+            yield k, v
+
+    def __repr__(self):
+        lst = []
+        for item in self._impl._items:
+            lst.append("{!r}: {!r}".format(item[1], item[2]))
+        body = ", ".join(lst)
+        return "{}({})".format(self.__class__.__name__, body)
+
+
+class _ValuesView(_ViewBase, abc.ValuesView):
+    def __contains__(self, value):
+        for item in self._impl._items:
+            if item[2] == value:
+                return True
+        return False
+
+    def __iter__(self):
+        return _Iter(len(self), self._iter(self._impl._version))
+
+    def _iter(self, version):
+        for item in self._impl._items:
+            if version != self._impl._version:
+                raise RuntimeError("Dictionary changed during iteration")
+            yield item[2]
+
+    def __repr__(self):
+        lst = []
+        for item in self._impl._items:
+            lst.append("{!r}".format(item[2]))
+        body = ", ".join(lst)
+        return "{}({})".format(self.__class__.__name__, body)
+
+
+class _KeysView(_ViewBase, abc.KeysView):
+    def __contains__(self, key):
+        for item in self._impl._items:
+            if item[1] == key:
+                return True
+        return False
+
+    def __iter__(self):
+        return _Iter(len(self), self._iter(self._impl._version))
+
+    def _iter(self, version):
+        for item in self._impl._items:
+            if version != self._impl._version:
+                raise RuntimeError("Dictionary changed during iteration")
+            yield item[1]
+
+    def __repr__(self):
+        lst = []
+        for item in self._impl._items:
+            lst.append("{!r}".format(item[1]))
+        body = ", ".join(lst)
+        return "{}({})".format(self.__class__.__name__, body)
diff --git a/multidict/_multilib/defs.h b/multidict/_multilib/defs.h
new file mode 100644
index 0000000..c7027c8
--- /dev/null
+++ b/multidict/_multilib/defs.h
@@ -0,0 +1,22 @@
+#ifndef _MULTIDICT_DEFS_H
+#define _MULTIDICT_DEFS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+_Py_IDENTIFIER(lower);
+
+/* We link this module statically for convenience.  If compiled as a shared
+   library instead, some compilers don't allow addresses of Python objects
+   defined in other libraries to be used in static initializers here.  The
+   DEFERRED_ADDRESS macro is used to tag the slots where such addresses
+   appear; the module init function must fill in the tagged slots at runtime.
+   The argument is for documentation -- the macro ignores it.
+*/
+#define DEFERRED_ADDRESS(ADDR) 0
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/multidict/_multilib/dict.h b/multidict/_multilib/dict.h
new file mode 100644
index 0000000..3caf83e
--- /dev/null
+++ b/multidict/_multilib/dict.h
@@ -0,0 +1,24 @@
+#ifndef _MULTIDICT_C_H
+#define _MULTIDICT_C_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {  // 16 or 24 for GC prefix
+    PyObject_HEAD  // 16
+    PyObject *weaklist;
+    pair_list_t pairs;
+} MultiDictObject;
+
+typedef struct {
+    PyObject_HEAD
+    PyObject *weaklist;
+    MultiDictObject *md;
+} MultiDictProxyObject;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/multidict/_multilib/istr.h b/multidict/_multilib/istr.h
new file mode 100644
index 0000000..2688f48
--- /dev/null
+++ b/multidict/_multilib/istr.h
@@ -0,0 +1,85 @@
+#ifndef _MULTIDICT_ISTR_H
+#define _MULTIDICT_ISTR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    PyUnicodeObject str;
+    PyObject * canonical;
+} istrobject;
+
+PyDoc_STRVAR(istr__doc__, "istr class implementation");
+
+static PyTypeObject istr_type;
+
+static inline void
+istr_dealloc(istrobject *self)
+{
+    Py_XDECREF(self->canonical);
+    PyUnicode_Type.tp_dealloc((PyObject*)self);
+}
+
+static inline PyObject *
+istr_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+    PyObject *x = NULL;
+    static char *kwlist[] = {"object", "encoding", "errors", 0};
+    PyObject *encoding = NULL;
+    PyObject *errors = NULL;
+    PyObject *s = NULL;
+    PyObject * ret = NULL;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "|OOO:str",
+                                     kwlist, &x, &encoding, &errors)) {
+        return NULL;
+    }
+    if (x != NULL && Py_TYPE(x) == &istr_type) {
+        Py_INCREF(x);
+        return x;
+    }
+    ret = PyUnicode_Type.tp_new(type, args, kwds);
+    if (!ret) {
+        goto fail;
+    }
+    s =_PyObject_CallMethodId(ret, &PyId_lower, NULL);
+    if (!s) {
+        goto fail;
+    }
+    ((istrobject*)ret)->canonical = s;
+    s = NULL;  /* the reference is stollen by .canonical */
+    return ret;
+fail:
+    Py_XDECREF(ret);
+    return NULL;
+}
+
+static PyTypeObject istr_type = {
+    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
+    "multidict._multidict.istr",
+    sizeof(istrobject),
+    .tp_dealloc = (destructor)istr_dealloc,
+    .tp_flags = Py_TPFLAGS_DEFAULT
+              | Py_TPFLAGS_BASETYPE
+              | Py_TPFLAGS_UNICODE_SUBCLASS,
+    .tp_doc = istr__doc__,
+    .tp_base = DEFERRED_ADDRESS(&PyUnicode_Type),
+    .tp_new = (newfunc)istr_new,
+};
+
+
+static inline int
+istr_init(void)
+{
+    istr_type.tp_base = &PyUnicode_Type;
+    if (PyType_Ready(&istr_type) < 0) {
+        return -1;
+    }
+    return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/multidict/_multilib/iter.h b/multidict/_multilib/iter.h
new file mode 100644
index 0000000..4e2e32b
--- /dev/null
+++ b/multidict/_multilib/iter.h
@@ -0,0 +1,238 @@
+#ifndef _MULTIDICT_ITER_H
+#define _MULTIDICT_ITER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static PyTypeObject multidict_items_iter_type;
+static PyTypeObject multidict_values_iter_type;
+static PyTypeObject multidict_keys_iter_type;
+
+typedef struct multidict_iter {
+    PyObject_HEAD
+    MultiDictObject *md;  // MultiDict or CIMultiDict
+    Py_ssize_t current;
+    uint64_t version;
+} MultidictIter;
+
+static inline void
+_init_iter(MultidictIter *it, MultiDictObject *md)
+{
+    Py_INCREF(md);
+
+    it->md = md;
+    it->current = 0;
+    it->version = pair_list_version(&md->pairs);
+}
+
+static inline PyObject *
+multidict_items_iter_new(MultiDictObject *md)
+{
+    MultidictIter *it = PyObject_GC_New(
+        MultidictIter, &multidict_items_iter_type);
+    if (it == NULL) {
+        return NULL;
+    }
+
+    _init_iter(it, md);
+
+    PyObject_GC_Track(it);
+    return (PyObject *)it;
+}
+
+static inline PyObject *
+multidict_keys_iter_new(MultiDictObject *md)
+{
+    MultidictIter *it = PyObject_GC_New(
+        MultidictIter, &multidict_keys_iter_type);
+    if (it == NULL) {
+        return NULL;
+    }
+
+    _init_iter(it, md);
+
+    PyObject_GC_Track(it);
+    return (PyObject *)it;
+}
+
+static inline PyObject *
+multidict_values_iter_new(MultiDictObject *md)
+{
+    MultidictIter *it = PyObject_GC_New(
+        MultidictIter, &multidict_values_iter_type);
+    if (it == NULL) {
+        return NULL;
+    }
+
+    _init_iter(it, md);
+
+    PyObject_GC_Track(it);
+    return (PyObject *)it;
+}
+
+static inline PyObject *
+multidict_items_iter_iternext(MultidictIter *self)
+{
+    PyObject *key = NULL;
+    PyObject *value = NULL;
+    PyObject *ret = NULL;
+
+    if (self->version != pair_list_version(&self->md->pairs)) {
+        PyErr_SetString(PyExc_RuntimeError, "Dictionary changed during iteration");
+        return NULL;
+    }
+
+    if (!_pair_list_next(&self->md->pairs, &self->current, NULL, &key, &value, NULL)) {
+        PyErr_SetNone(PyExc_StopIteration);
+        return NULL;
+    }
+
+    ret = PyTuple_Pack(2, key, value);
+    if (ret == NULL) {
+        return NULL;
+    }
+
+    return ret;
+}
+
+static inline PyObject *
+multidict_values_iter_iternext(MultidictIter *self)
+{
+    PyObject *value = NULL;
+
+    if (self->version != pair_list_version(&self->md->pairs)) {
+        PyErr_SetString(PyExc_RuntimeError, "Dictionary changed during iteration");
+        return NULL;
+    }
+
+    if (!pair_list_next(&self->md->pairs, &self->current, NULL, NULL, &value)) {
+        PyErr_SetNone(PyExc_StopIteration);
+        return NULL;
+    }
+
+    Py_INCREF(value);
+
+    return value;
+}
+
+static inline PyObject *
+multidict_keys_iter_iternext(MultidictIter *self)
+{
+    PyObject *key = NULL;
+
+    if (self->version != pair_list_version(&self->md->pairs)) {
+        PyErr_SetString(PyExc_RuntimeError, "Dictionary changed during iteration");
+        return NULL;
+    }
+
+    if (!pair_list_next(&self->md->pairs, &self->current, NULL, &key, NULL)) {
+        PyErr_SetNone(PyExc_StopIteration);
+        return NULL;
+    }
+
+    Py_INCREF(key);
+
+    return key;
+}
+
+static inline void
+multidict_iter_dealloc(MultidictIter *self)
+{
+    PyObject_GC_UnTrack(self);
+    Py_XDECREF(self->md);
+    PyObject_GC_Del(self);
+}
+
+static inline int
+multidict_iter_traverse(MultidictIter *self, visitproc visit, void *arg)
+{
+    Py_VISIT(self->md);
+    return 0;
+}
+
+static inline int
+multidict_iter_clear(MultidictIter *self)
+{
+    Py_CLEAR(self->md);
+    return 0;
+}
+
+static inline PyObject *
+multidict_iter_len(MultidictIter *self)
+{
+    return PyLong_FromLong(pair_list_len(&self->md->pairs));
+}
+
+PyDoc_STRVAR(length_hint_doc,
+             "Private method returning an estimate of len(list(it)).");
+
+static PyMethodDef multidict_iter_methods[] = {
+    {
+        "__length_hint__",
+        (PyCFunction)(void(*)(void))multidict_iter_len,
+        METH_NOARGS,
+        length_hint_doc
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+/***********************************************************************/
+
+static PyTypeObject multidict_items_iter_type = {
+    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
+    "multidict._multidict._itemsiter",         /* tp_name */
+    sizeof(MultidictIter),                     /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_iter_dealloc,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+    .tp_traverse = (traverseproc)multidict_iter_traverse,
+    .tp_clear = (inquiry)multidict_iter_clear,
+    .tp_iter = PyObject_SelfIter,
+    .tp_iternext = (iternextfunc)multidict_items_iter_iternext,
+    .tp_methods = multidict_iter_methods,
+};
+
+static PyTypeObject multidict_values_iter_type = {
+    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
+    "multidict._multidict._valuesiter",         /* tp_name */
+    sizeof(MultidictIter),                      /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_iter_dealloc,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+    .tp_traverse = (traverseproc)multidict_iter_traverse,
+    .tp_clear = (inquiry)multidict_iter_clear,
+    .tp_iter = PyObject_SelfIter,
+    .tp_iternext = (iternextfunc)multidict_values_iter_iternext,
+    .tp_methods = multidict_iter_methods,
+};
+
+static PyTypeObject multidict_keys_iter_type = {
+    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
+    "multidict._multidict._keysiter",         /* tp_name */
+    sizeof(MultidictIter),                    /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_iter_dealloc,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+    .tp_traverse = (traverseproc)multidict_iter_traverse,
+    .tp_clear = (inquiry)multidict_iter_clear,
+    .tp_iter = PyObject_SelfIter,
+    .tp_iternext = (iternextfunc)multidict_keys_iter_iternext,
+    .tp_methods = multidict_iter_methods,
+};
+
+static inline int
+multidict_iter_init()
+{
+    if (PyType_Ready(&multidict_items_iter_type) < 0 ||
+        PyType_Ready(&multidict_values_iter_type) < 0 ||
+        PyType_Ready(&multidict_keys_iter_type) < 0) {
+        return -1;
+    }
+    return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/multidict/_multilib/pair_list.h b/multidict/_multilib/pair_list.h
new file mode 100644
index 0000000..7eafd21
--- /dev/null
+++ b/multidict/_multilib/pair_list.h
@@ -0,0 +1,1244 @@
+#ifndef _MULTIDICT_PAIR_LIST_H
+#define _MULTIDICT_PAIR_LIST_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <string.h>
+#include <stddef.h>
+#include <stdint.h>
+
+typedef PyObject * (*calc_identity_func)(PyObject *key);
+
+typedef struct pair {
+    PyObject  *identity;  // 8
+    PyObject  *key;       // 8
+    PyObject  *value;     // 8
+    Py_hash_t  hash;      // 8
+} pair_t;
+
+/* Note about the structure size
+With 29 pairs the MultiDict object size is slightly less than 1KiB
+(1000-1008 bytes depending on Python version,
+plus extra 12 bytes for memory allocator internal structures).
+As the result the max reserved size is 1020 bytes at most.
+
+To fit into 512 bytes, the structure can contain only 13 pairs
+which is too small, e.g. https://www.python.org returns 16 headers
+(9 of them are caching proxy information though).
+
+The embedded buffer intention is to fit the vast majority of possible
+HTTP headers into the buffer without allocating an extra memory block.
+*/
+
+#if (PY_VERSION_HEX < 0x03080000)
+#define EMBEDDED_CAPACITY 28
+#else
+#define EMBEDDED_CAPACITY 29
+#endif
+
+typedef struct pair_list {  // 40
+    Py_ssize_t  capacity;   // 8
+    Py_ssize_t  size;       // 8
+    uint64_t  version;      // 8
+    calc_identity_func calc_identity;  // 8
+    pair_t *pairs;          // 8
+    pair_t buffer[EMBEDDED_CAPACITY];
+} pair_list_t;
+
+#define MIN_CAPACITY 63
+#define CAPACITY_STEP 64
+
+/* Global counter used to set ma_version_tag field of dictionary.
+ * It is incremented each time that a dictionary is created and each
+ * time that a dictionary is modified. */
+static uint64_t pair_list_global_version = 0;
+
+#define NEXT_VERSION() (++pair_list_global_version)
+
+
+static inline int
+str_cmp(PyObject *s1, PyObject *s2)
+{
+    PyObject *ret = PyUnicode_RichCompare(s1, s2, Py_EQ);
+    if (ret == Py_True) {
+        Py_DECREF(ret);
+        return 1;
+    }
+    else if (ret == NULL) {
+        return -1;
+    }
+    else {
+        Py_DECREF(ret);
+        return 0;
+    }
+}
+
+
+static inline PyObject *
+key_to_str(PyObject *key)
+{
+    PyObject *ret;
+    PyTypeObject *type = Py_TYPE(key);
+    if (type == &istr_type) {
+        ret = ((istrobject*)key)->canonical;
+        Py_INCREF(ret);
+        return ret;
+    }
+    if (PyUnicode_CheckExact(key)) {
+        Py_INCREF(key);
+        return key;
+    }
+    if (PyUnicode_Check(key)) {
+        return PyObject_Str(key);
+    }
+    PyErr_SetString(PyExc_TypeError,
+                    "MultiDict keys should be either str "
+                    "or subclasses of str");
+    return NULL;
+}
+
+
+static inline PyObject *
+ci_key_to_str(PyObject *key)
+{
+    PyObject *ret;
+    PyTypeObject *type = Py_TYPE(key);
+    if (type == &istr_type) {
+        ret = ((istrobject*)key)->canonical;
+        Py_INCREF(ret);
+        return ret;
+    }
+    if (PyUnicode_Check(key)) {
+        return _PyObject_CallMethodId(key, &PyId_lower, NULL);
+    }
+    PyErr_SetString(PyExc_TypeError,
+                    "CIMultiDict keys should be either str "
+                    "or subclasses of str");
+    return NULL;
+}
+
+static inline pair_t *
+pair_list_get(pair_list_t *list, Py_ssize_t i)
+{
+    pair_t *item = list->pairs + i;
+    return item;
+}
+
+
+static inline int
+pair_list_grow(pair_list_t *list)
+{
+    // Grow by one element if needed
+    Py_ssize_t new_capacity;
+    pair_t *new_pairs;
+
+    if (list->size < list->capacity) {
+        return 0;
+    }
+
+    if (list->pairs == list->buffer) {
+        new_pairs = PyMem_New(pair_t, MIN_CAPACITY);
+        memcpy(new_pairs, list->buffer, (size_t)list->capacity * sizeof(pair_t));
+
+        list->pairs = new_pairs;
+        list->capacity = MIN_CAPACITY;
+        return 0;
+    } else {
+        new_capacity = list->capacity + CAPACITY_STEP;
+        new_pairs = PyMem_Resize(list->pairs, pair_t, (size_t)new_capacity);
+
+        if (NULL == new_pairs) {
+            // Resizing error
+            return -1;
+        }
+
+        list->pairs = new_pairs;
+        list->capacity = new_capacity;
+        return 0;
+    }
+}
+
+
+static inline int
+pair_list_shrink(pair_list_t *list)
+{
+    // Shrink by one element if needed.
+    // Optimization is applied to prevent jitter
+    // (grow-shrink-grow-shrink on adding-removing the single element
+    // when the buffer is full).
+    // To prevent this, the buffer is resized if the size is less than the capacity
+    // by 2*CAPACITY_STEP factor.
+    // The switch back to embedded buffer is never performed for both reasons:
+    // the code simplicity and the jitter prevention.
+
+    pair_t *new_pairs;
+    Py_ssize_t new_capacity;
+
+    if (list->capacity - list->size < 2 * CAPACITY_STEP) {
+        return 0;
+    }
+    new_capacity = list->capacity - CAPACITY_STEP;
+    if (new_capacity < MIN_CAPACITY) {
+        return 0;
+    }
+
+    new_pairs = PyMem_Resize(list->pairs, pair_t, (size_t)new_capacity);
+
+    if (NULL == new_pairs) {
+        // Resizing error
+        return -1;
+    }
+
+    list->pairs = new_pairs;
+    list->capacity = new_capacity;
+
+    return 0;
+}
+
+
+static inline int
+_pair_list_init(pair_list_t *list, calc_identity_func calc_identity)
+{
+    list->pairs = list->buffer;
+    list->capacity = EMBEDDED_CAPACITY;
+    list->size = 0;
+    list->version = NEXT_VERSION();
+    list->calc_identity = calc_identity;
+    return 0;
+}
+
+static inline int
+pair_list_init(pair_list_t *list)
+{
+    return _pair_list_init(list, key_to_str);
+}
+
+
+static inline int
+ci_pair_list_init(pair_list_t *list)
+{
+    return _pair_list_init(list, ci_key_to_str);
+}
+
+
+static inline void
+pair_list_dealloc(pair_list_t *list)
+{
+    pair_t *pair;
+    Py_ssize_t pos;
+
+    for (pos = 0; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+
+        Py_XDECREF(pair->identity);
+        Py_XDECREF(pair->key);
+        Py_XDECREF(pair->value);
+    }
+
+    /*
+    Strictly speaking, resetting size and capacity and
+    assigning pairs to buffer is not necessary.
+    Do it to consistency and idemotency.
+    The cleanup doesn't hurt performance.
+    !!!
+    !!! The buffer deletion is crucial though.
+    !!!
+    */
+    list->size = 0;
+    if (list->pairs != list->buffer) {
+        PyMem_Del(list->pairs);
+        list->pairs = list->buffer;
+        list->capacity = EMBEDDED_CAPACITY;
+    }
+}
+
+
+static inline Py_ssize_t
+pair_list_len(pair_list_t *list)
+{
+    return list->size;
+}
+
+
+static inline int
+_pair_list_add_with_hash(pair_list_t *list,
+                         PyObject *identity,
+                         PyObject *key,
+                         PyObject *value,
+                         Py_hash_t hash)
+{
+    pair_t *pair;
+
+    if (pair_list_grow(list) < 0) {
+        return -1;
+    }
+
+    pair = pair_list_get(list, list->size);
+
+    Py_INCREF(identity);
+    pair->identity = identity;
+
+    Py_INCREF(key);
+    pair->key = key;
+
+    Py_INCREF(value);
+    pair->value = value;
+
+    pair->hash = hash;
+
+    list->version = NEXT_VERSION();
+    list->size += 1;
+
+    return 0;
+}
+
+
+static inline int
+pair_list_add(pair_list_t *list,
+              PyObject *key,
+              PyObject *value)
+{
+    Py_hash_t hash;
+    PyObject *identity = NULL;
+    int ret;
+
+    identity = list->calc_identity(key);
+    if (identity == NULL) {
+        goto fail;
+    }
+    hash = PyObject_Hash(identity);
+    if (hash == -1) {
+        goto fail;
+    }
+    ret = _pair_list_add_with_hash(list, identity, key, value, hash);
+    Py_DECREF(identity);
+    return ret;
+fail:
+    Py_XDECREF(identity);
+    return -1;
+}
+
+
+static inline int
+pair_list_del_at(pair_list_t *list, Py_ssize_t pos)
+{
+    // return 1 on success, -1 on failure
+    Py_ssize_t tail;
+    pair_t *pair;
+
+    pair = pair_list_get(list, pos);
+    Py_DECREF(pair->identity);
+    Py_DECREF(pair->key);
+    Py_DECREF(pair->value);
+
+    list->size -= 1;
+    list->version = NEXT_VERSION();
+
+    if (list->size == pos) {
+        // remove from tail, no need to shift body
+        return 0;
+    }
+
+    tail = list->size - pos;
+    // TODO: raise an error if tail < 0
+    memmove((void *)pair_list_get(list, pos),
+            (void *)pair_list_get(list, pos + 1),
+            sizeof(pair_t) * (size_t)tail);
+
+    return pair_list_shrink(list);
+}
+
+
+static inline int
+_pair_list_drop_tail(pair_list_t *list, PyObject *identity, Py_hash_t hash,
+                     Py_ssize_t pos)
+{
+    // return 1 if deleted, 0 if not found
+    pair_t *pair;
+    int ret;
+    int found = 0;
+
+    if (pos >= list->size) {
+        return 0;
+    }
+
+    for (; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+        if (pair->hash != hash) {
+            continue;
+        }
+        ret = str_cmp(pair->identity, identity);
+        if (ret > 0) {
+            if (pair_list_del_at(list, pos) < 0) {
+               return -1;
+            }
+            found = 1;
+            pos--;
+        }
+        else if (ret == -1) {
+            return -1;
+        }
+    }
+
+    return found;
+}
+
+static inline int
+_pair_list_del_hash(pair_list_t *list, PyObject *identity,
+                    PyObject *key, Py_hash_t hash)
+{
+    int ret = _pair_list_drop_tail(list, identity, hash, 0);
+
+    if (ret < 0) {
+        return -1;
+    }
+    else if (ret == 0) {
+        PyErr_SetObject(PyExc_KeyError, key);
+        return -1;
+    }
+    else {
+        list->version = NEXT_VERSION();
+        return 0;
+    }
+}
+
+
+static inline int
+pair_list_del(pair_list_t *list, PyObject *key)
+{
+    PyObject *identity = NULL;
+    Py_hash_t hash;
+    int ret;
+
+    identity = list->calc_identity(key);
+    if (identity == NULL) {
+        goto fail;
+    }
+
+    hash = PyObject_Hash(identity);
+    if (hash == -1) {
+        goto fail;
+    }
+
+    ret = _pair_list_del_hash(list, identity, key, hash);
+    Py_DECREF(identity);
+    return ret;
+fail:
+    Py_XDECREF(identity);
+    return -1;
+}
+
+
+static inline uint64_t
+pair_list_version(pair_list_t *list)
+{
+    return list->version;
+}
+
+
+static inline int
+_pair_list_next(pair_list_t *list, Py_ssize_t *ppos, PyObject **pidentity,
+                PyObject **pkey, PyObject **pvalue, Py_hash_t *phash)
+{
+    pair_t *pair;
+
+    if (*ppos >= list->size) {
+        return 0;
+    }
+
+    pair = pair_list_get(list, *ppos);
+
+    if (pidentity) {
+        *pidentity = pair->identity;
+    }
+    if (pkey) {
+        *pkey = pair->key;
+    }
+    if (pvalue) {
+        *pvalue = pair->value;
+    }
+    if (phash) {
+        *phash = pair->hash;
+    }
+
+    *ppos += 1;
+    return 1;
+}
+
+
+static inline int
+pair_list_next(pair_list_t *list, Py_ssize_t *ppos, PyObject **pidentity,
+               PyObject **pkey, PyObject **pvalue)
+{
+    Py_hash_t hash;
+    return _pair_list_next(list, ppos, pidentity, pkey, pvalue, &hash);
+}
+
+
+static inline int
+pair_list_contains(pair_list_t *list, PyObject *key)
+{
+    Py_hash_t hash1, hash2;
+    Py_ssize_t pos = 0;
+    PyObject *ident = NULL;
+    PyObject *identity = NULL;
+    int tmp;
+
+    ident = list->calc_identity(key);
+    if (ident == NULL) {
+        goto fail;
+    }
+
+    hash1 = PyObject_Hash(ident);
+    if (hash1 == -1) {
+        goto fail;
+    }
+
+    while (_pair_list_next(list, &pos, &identity, NULL, NULL, &hash2)) {
+        if (hash1 != hash2) {
+            continue;
+        }
+        tmp = str_cmp(ident, identity);
+        if (tmp > 0) {
+            Py_DECREF(ident);
+            return 1;
+        }
+        else if (tmp < 0) {
+            goto fail;
+        }
+    }
+
+    Py_DECREF(ident);
+    return 0;
+fail:
+    Py_XDECREF(ident);
+    return -1;
+}
+
+
+static inline PyObject *
+pair_list_get_one(pair_list_t *list, PyObject *key)
+{
+    Py_hash_t hash1, hash2;
+    Py_ssize_t pos = 0;
+    PyObject *ident = NULL;
+    PyObject *identity = NULL;
+    PyObject *value = NULL;
+    int tmp;
+
+    ident = list->calc_identity(key);
+    if (ident == NULL) {
+        goto fail;
+    }
+
+    hash1 = PyObject_Hash(ident);
+    if (hash1 == -1) {
+        goto fail;
+    }
+
+    while (_pair_list_next(list, &pos, &identity, NULL, &value, &hash2)) {
+        if (hash1 != hash2) {
+            continue;
+        }
+        tmp = str_cmp(ident, identity);
+        if (tmp > 0) {
+            Py_INCREF(value);
+            Py_DECREF(ident);
+            return value;
+        }
+        else if (tmp < 0) {
+            goto fail;
+        }
+    }
+
+    Py_DECREF(ident);
+    PyErr_SetObject(PyExc_KeyError, key);
+    return NULL;
+fail:
+    Py_XDECREF(ident);
+    return NULL;
+}
+
+
+static inline PyObject *
+pair_list_get_all(pair_list_t *list, PyObject *key)
+{
+    Py_hash_t hash1, hash2;
+    Py_ssize_t pos = 0;
+    PyObject *ident = NULL;
+    PyObject *identity = NULL;
+    PyObject *value = NULL;
+    PyObject *res = NULL;
+    int tmp;
+
+    ident = list->calc_identity(key);
+    if (ident == NULL) {
+        goto fail;
+    }
+
+    hash1 = PyObject_Hash(ident);
+    if (hash1 == -1) {
+        goto fail;
+    }
+
+    while (_pair_list_next(list, &pos, &identity, NULL, &value, &hash2)) {
+        if (hash1 != hash2) {
+            continue;
+        }
+        tmp = str_cmp(ident, identity);
+        if (tmp > 0) {
+            if (res == NULL) {
+                res = PyList_New(1);
+                if (res == NULL) {
+                    goto fail;
+                }
+                if (PyList_SetItem(res, 0, value) < 0) {
+                    goto fail;
+                }
+                Py_INCREF(value);
+            }
+            else if (PyList_Append(res, value) < 0) {
+                goto fail;
+            }
+        }
+        else if (tmp < 0) {
+            goto fail;
+        }
+    }
+
+    if (res == NULL) {
+        PyErr_SetObject(PyExc_KeyError, key);
+    }
+    Py_DECREF(ident);
+    return res;
+
+fail:
+    Py_XDECREF(ident);
+    Py_XDECREF(res);
+    return NULL;
+}
+
+
+static inline PyObject *
+pair_list_set_default(pair_list_t *list, PyObject *key, PyObject *value)
+{
+    Py_hash_t hash1, hash2;
+    Py_ssize_t pos = 0;
+    PyObject *ident = NULL;
+    PyObject *identity = NULL;
+    PyObject *value2 = NULL;
+    int tmp;
+
+    ident = list->calc_identity(key);
+    if (ident == NULL) {
+        goto fail;
+    }
+
+    hash1 = PyObject_Hash(ident);
+    if (hash1 == -1) {
+        goto fail;
+    }
+
+    while (_pair_list_next(list, &pos, &identity, NULL, &value2, &hash2)) {
+        if (hash1 != hash2) {
+            continue;
+        }
+        tmp = str_cmp(ident, identity);
+        if (tmp > 0) {
+            Py_INCREF(value2);
+            Py_DECREF(ident);
+            return value2;
+        }
+        else if (tmp < 0) {
+            goto fail;
+        }
+    }
+
+    if (_pair_list_add_with_hash(list, ident, key, value, hash1) < 0) {
+        goto fail;
+    }
+
+    Py_INCREF(value);
+    Py_DECREF(ident);
+    return value;
+fail:
+    Py_XDECREF(ident);
+    return NULL;
+}
+
+
+static inline PyObject *
+pair_list_pop_one(pair_list_t *list, PyObject *key)
+{
+    pair_t *pair;
+
+    Py_hash_t hash;
+    Py_ssize_t pos;
+    PyObject *value = NULL;
+    int tmp;
+    PyObject *ident = NULL;
+
+    ident = list->calc_identity(key);
+    if (ident == NULL) {
+        goto fail;
+    }
+
+    hash = PyObject_Hash(ident);
+    if (hash == -1) {
+        goto fail;
+    }
+
+    for (pos=0; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+        if (pair->hash != hash) {
+            continue;
+        }
+        tmp = str_cmp(ident, pair->identity);
+        if (tmp > 0) {
+            value = pair->value;
+            Py_INCREF(value);
+            if (pair_list_del_at(list, pos) < 0) {
+                goto fail;
+            }
+            Py_DECREF(ident);
+            return value;
+        }
+        else if (tmp < 0) {
+            goto fail;
+        }
+    }
+
+    PyErr_SetObject(PyExc_KeyError, key);
+    goto fail;
+
+fail:
+    Py_XDECREF(value);
+    Py_XDECREF(ident);
+    return NULL;
+}
+
+
+static inline PyObject *
+pair_list_pop_all(pair_list_t *list, PyObject *key)
+{
+    Py_hash_t hash;
+    Py_ssize_t pos;
+    pair_t *pair;
+    int tmp;
+    PyObject *res = NULL;
+    PyObject *ident = NULL;
+
+    ident = list->calc_identity(key);
+    if (ident == NULL) {
+        goto fail;
+    }
+
+    hash = PyObject_Hash(ident);
+    if (hash == -1) {
+        goto fail;
+    }
+
+    if (list->size == 0) {
+        PyErr_SetObject(PyExc_KeyError, ident);
+        goto fail;
+    }
+
+    for (pos = list->size - 1; pos >= 0; pos--) {
+        pair = pair_list_get(list, pos);
+        if (hash != pair->hash) {
+            continue;
+        }
+        tmp = str_cmp(ident, pair->identity);
+        if (tmp > 0) {
+            if (res == NULL) {
+                res = PyList_New(1);
+                if (res == NULL) {
+                    goto fail;
+                }
+                if (PyList_SetItem(res, 0, pair->value) < 0) {
+                    goto fail;
+                }
+                Py_INCREF(pair->value);
+            } else if (PyList_Append(res, pair->value) < 0) {
+                goto fail;
+            }
+            if (pair_list_del_at(list, pos) < 0) {
+                goto fail;
+            }
+        }
+        else if (tmp < 0) {
+            goto fail;
+        }
+    }
+
+    if (res == NULL) {
+        PyErr_SetObject(PyExc_KeyError, key);
+    } else if (PyList_Reverse(res) < 0) {
+        goto fail;
+    }
+    Py_DECREF(ident);
+    return res;
+
+fail:
+    Py_XDECREF(ident);
+    Py_XDECREF(res);
+    return NULL;
+}
+
+
+static inline PyObject *
+pair_list_pop_item(pair_list_t *list)
+{
+    PyObject *ret;
+    pair_t *pair;
+
+    if (list->size == 0) {
+        PyErr_SetString(PyExc_KeyError, "empty multidict");
+        return NULL;
+    }
+
+    pair = pair_list_get(list, 0);
+    ret = PyTuple_Pack(2, pair->key, pair->value);
+    if (ret == NULL) {
+        return NULL;
+    }
+
+    if (pair_list_del_at(list, 0) < 0) {
+        Py_DECREF(ret);
+        return NULL;
+    }
+
+    return ret;
+}
+
+
+static inline int
+pair_list_replace(pair_list_t *list, PyObject * key, PyObject *value)
+{
+    pair_t *pair;
+
+    Py_ssize_t pos;
+    int tmp;
+    int found = 0;
+
+    PyObject *identity = NULL;
+    Py_hash_t hash;
+
+    identity = list->calc_identity(key);
+    if (identity == NULL) {
+        goto fail;
+    }
+
+    hash = PyObject_Hash(identity);
+    if (hash == -1) {
+        goto fail;
+    }
+
+
+    for (pos = 0; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+        if (hash != pair->hash) {
+            continue;
+        }
+        tmp = str_cmp(identity, pair->identity);
+        if (tmp > 0) {
+            found = 1;
+            Py_INCREF(key);
+            Py_DECREF(pair->key);
+            pair->key = key;
+            Py_INCREF(value);
+            Py_DECREF(pair->value);
+            pair->value = value;
+            break;
+        }
+        else if (tmp < 0) {
+            goto fail;
+        }
+    }
+
+    if (!found) {
+        if (_pair_list_add_with_hash(list, identity, key, value, hash) < 0) {
+            goto fail;
+        }
+        Py_DECREF(identity);
+        return 0;
+    }
+    else {
+        list->version = NEXT_VERSION();
+        if (_pair_list_drop_tail(list, identity, hash, pos+1) < 0) {
+            goto fail;
+        }
+        Py_DECREF(identity);
+        return 0;
+    }
+fail:
+    Py_XDECREF(identity);
+    return -1;
+}
+
+
+static inline int
+_dict_set_number(PyObject *dict, PyObject *key, Py_ssize_t num)
+{
+    PyObject *tmp = PyLong_FromSsize_t(num);
+    if (tmp == NULL) {
+       return -1;
+    }
+
+    if (PyDict_SetItem(dict, key, tmp) < 0) {
+        Py_DECREF(tmp);
+        return -1;
+    }
+
+    return 0;
+}
+
+
+static inline int
+_pair_list_post_update(pair_list_t *list, PyObject* used_keys, Py_ssize_t pos)
+{
+    pair_t *pair;
+    PyObject *tmp;
+    Py_ssize_t num;
+
+    for (; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+        tmp = PyDict_GetItem(used_keys, pair->identity);
+        if (tmp == NULL) {
+            // not found
+            continue;
+        }
+
+        num = PyLong_AsSsize_t(tmp);
+        if (num == -1) {
+            if (!PyErr_Occurred()) {
+                PyErr_SetString(PyExc_RuntimeError, "invalid internal state");
+            }
+            return -1;
+        }
+
+        if (pos >= num) {
+            // del self[pos]
+            if (pair_list_del_at(list, pos) < 0) {
+                return -1;
+            }
+            pos--;
+        }
+    }
+
+    list->version = NEXT_VERSION();
+    return 0;
+}
+
+// TODO: need refactoring function name
+static inline int
+_pair_list_update(pair_list_t *list, PyObject *key,
+                  PyObject *value, PyObject *used_keys,
+                  PyObject *identity, Py_hash_t hash)
+{
+    PyObject *item = NULL;
+    pair_t *pair = NULL;
+    Py_ssize_t pos;
+    int found;
+    int ident_cmp_res;
+
+    item = PyDict_GetItem(used_keys, identity);
+    if (item == NULL) {
+        pos = 0;
+    }
+    else {
+        pos = PyLong_AsSsize_t(item);
+        if (pos == -1) {
+            if (!PyErr_Occurred()) {
+                PyErr_SetString(PyExc_RuntimeError, "invalid internal state");
+            }
+            return -1;
+        }
+    }
+
+    found = 0;
+    for (; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+        if (pair->hash != hash) {
+            continue;
+        }
+
+        ident_cmp_res = str_cmp(pair->identity, identity);
+        if (ident_cmp_res > 0) {
+            Py_INCREF(key);
+            Py_DECREF(pair->key);
+            pair->key = key;
+
+            Py_INCREF(value);
+            Py_DECREF(pair->value);
+            pair->value = value;
+
+            if (_dict_set_number(used_keys, pair->identity, pos + 1) < 0) {
+                return -1;
+            }
+
+            found = 1;
+            break;
+        }
+        else if (ident_cmp_res < 0) {
+            return -1;
+        }
+    }
+
+    if (!found) {
+        if (_pair_list_add_with_hash(list, identity, key, value, hash) < 0) {
+            return -1;
+        }
+        if (_dict_set_number(used_keys, identity, list->size) < 0) {
+            return -1;
+        }
+    }
+
+    return 0;
+}
+
+
+static inline int
+pair_list_update(pair_list_t *list, pair_list_t *other)
+{
+    PyObject *used_keys = NULL;
+    pair_t *pair = NULL;
+
+    Py_ssize_t pos;
+
+    if (other->size == 0) {
+        return 0;
+    }
+
+    used_keys = PyDict_New();
+    if (used_keys == NULL) {
+        return -1;
+    }
+
+    for (pos = 0; pos < other->size; pos++) {
+        pair = pair_list_get(other, pos);
+        if (_pair_list_update(list, pair->key, pair->value, used_keys,
+                              pair->identity, pair->hash) < 0) {
+            goto fail;
+        }
+    }
+
+    if (_pair_list_post_update(list, used_keys, 0) < 0) {
+        goto fail;
+    }
+
+    Py_DECREF(used_keys);
+    return 0;
+
+fail:
+    Py_XDECREF(used_keys);
+    return -1;
+}
+
+
+static inline int
+pair_list_update_from_seq(pair_list_t *list, PyObject *seq)
+{
+    PyObject *it = NULL; // iter(seq)
+    PyObject *fast = NULL; // item as a 2-tuple or 2-list
+    PyObject *item = NULL; // seq[i]
+    PyObject *used_keys = NULL; // dict(<Identitty: Pos>)
+
+    PyObject *key = NULL;
+    PyObject *value = NULL;
+    PyObject *identity = NULL;
+
+    Py_hash_t hash;
+
+    Py_ssize_t i;
+    Py_ssize_t n;
+
+    it = PyObject_GetIter(seq);
+    if (it == NULL) {
+        return -1;
+    }
+
+    used_keys = PyDict_New();
+    if (used_keys == NULL) {
+        goto fail_1;
+    }
+
+    for (i = 0; ; ++i) { // i - index into seq of current element
+        fast = NULL;
+        item = PyIter_Next(it);
+        if (item == NULL) {
+            if (PyErr_Occurred()) {
+                goto fail_1;
+            }
+            break;
+        }
+
+        // Convert item to sequence, and verify length 2.
+        fast = PySequence_Fast(item, "");
+        if (fast == NULL) {
+            if (PyErr_ExceptionMatches(PyExc_TypeError)) {
+                PyErr_Format(PyExc_TypeError,
+                             "multidict cannot convert sequence element #%zd"
+                             " to a sequence",
+                             i);
+            }
+            goto fail_1;
+        }
+
+        n = PySequence_Fast_GET_SIZE(fast);
+        if (n != 2) {
+            PyErr_Format(PyExc_ValueError,
+                         "multidict update sequence element #%zd "
+                         "has length %zd; 2 is required",
+                         i, n);
+            goto fail_1;
+        }
+
+        key = PySequence_Fast_GET_ITEM(fast, 0);
+        value = PySequence_Fast_GET_ITEM(fast, 1);
+        Py_INCREF(key);
+        Py_INCREF(value);
+
+        identity = list->calc_identity(key);
+        if (identity == NULL) {
+            goto fail_1;
+        }
+
+        hash = PyObject_Hash(identity);
+        if (hash == -1) {
+            goto fail_1;
+        }
+
+        if (_pair_list_update(list, key, value, used_keys, identity, hash) < 0) {
+            goto fail_1;
+        }
+
+        Py_DECREF(key);
+        Py_DECREF(value);
+        Py_DECREF(fast);
+        Py_DECREF(item);
+        Py_DECREF(identity);
+    }
+
+    if (_pair_list_post_update(list, used_keys, 0) < 0) {
+        goto fail_2;
+    }
+
+    Py_DECREF(it);
+    Py_DECREF(used_keys);
+    return 0;
+
+fail_1:
+    Py_XDECREF(key);
+    Py_XDECREF(value);
+    Py_XDECREF(fast);
+    Py_XDECREF(item);
+    Py_XDECREF(identity);
+
+fail_2:
+    Py_XDECREF(it);
+    Py_XDECREF(used_keys);
+    return -1;
+}
+
+static inline int
+pair_list_eq_to_mapping(pair_list_t *list, PyObject *other)
+{
+    PyObject *key = NULL;
+    PyObject *avalue = NULL;
+    PyObject *bvalue;
+
+    Py_ssize_t pos, other_len;
+
+    int eq;
+
+    if (!PyMapping_Check(other)) {
+        PyErr_Format(PyExc_TypeError,
+                     "other argument must be a mapping, not %s",
+                     Py_TYPE(other)->tp_name);
+        return -1;
+    }
+
+    other_len = PyMapping_Size(other);
+    if (other_len < 0) {
+        return -1;
+    }
+    if (pair_list_len(list) != other_len) {
+        return 0;
+    }
+
+    pos = 0;
+    while (pair_list_next(list, &pos, NULL, &key, &avalue)) {
+        bvalue = PyObject_GetItem(other, key);
+        if (bvalue == NULL) {
+            if (PyErr_ExceptionMatches(PyExc_KeyError)) {
+                PyErr_Clear();
+                return 0;
+            }
+            return -1;
+        }
+
+        eq = PyObject_RichCompareBool(avalue, bvalue, Py_EQ);
+        Py_DECREF(bvalue);
+
+        if (eq <= 0) {
+            return eq;
+        }
+    }
+
+    return 1;
+}
+
+
+/***********************************************************************/
+
+static inline int
+pair_list_traverse(pair_list_t *list, visitproc visit, void *arg)
+{
+    pair_t *pair = NULL;
+    Py_ssize_t pos;
+
+    for (pos = 0; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+        // Don't need traverse the identity: it is a terminal
+        Py_VISIT(pair->key);
+        Py_VISIT(pair->value);
+    }
+
+    return 0;
+}
+
+
+static inline int
+pair_list_clear(pair_list_t *list)
+{
+    pair_t *pair = NULL;
+    Py_ssize_t pos;
+
+    if (list->size == 0) {
+        return 0;
+    }
+
+    list->version = NEXT_VERSION();
+    for (pos = 0; pos < list->size; pos++) {
+        pair = pair_list_get(list, pos);
+        Py_CLEAR(pair->key);
+        Py_CLEAR(pair->identity);
+        Py_CLEAR(pair->value);
+    }
+    list->size = 0;
+    if (list->pairs != list->buffer) {
+        PyMem_Del(list->pairs);
+        list->pairs = list->buffer;
+    }
+
+    return 0;
+}
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/multidict/_multilib/views.h b/multidict/_multilib/views.h
new file mode 100644
index 0000000..5b1ebfe
--- /dev/null
+++ b/multidict/_multilib/views.h
@@ -0,0 +1,464 @@
+#ifndef _MULTIDICT_VIEWS_H
+#define _MULTIDICT_VIEWS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static PyTypeObject multidict_itemsview_type;
+static PyTypeObject multidict_valuesview_type;
+static PyTypeObject multidict_keysview_type;
+
+static PyObject *viewbaseset_richcmp_func;
+static PyObject *viewbaseset_and_func;
+static PyObject *viewbaseset_or_func;
+static PyObject *viewbaseset_sub_func;
+static PyObject *viewbaseset_xor_func;
+
+static PyObject *abc_itemsview_register_func;
+static PyObject *abc_keysview_register_func;
+static PyObject *abc_valuesview_register_func;
+
+static PyObject *itemsview_isdisjoint_func;
+static PyObject *itemsview_repr_func;
+
+static PyObject *keysview_repr_func;
+static PyObject *keysview_isdisjoint_func;
+
+static PyObject *valuesview_repr_func;
+
+typedef struct {
+    PyObject_HEAD
+    PyObject *md;
+} _Multidict_ViewObject;
+
+
+/********** Base **********/
+
+static inline void
+_init_view(_Multidict_ViewObject *self, PyObject *md)
+{
+    Py_INCREF(md);
+    self->md = md;
+}
+
+static inline void
+multidict_view_dealloc(_Multidict_ViewObject *self)
+{
+    PyObject_GC_UnTrack(self);
+    Py_XDECREF(self->md);
+    PyObject_GC_Del(self);
+}
+
+static inline int
+multidict_view_traverse(_Multidict_ViewObject *self, visitproc visit, void *arg)
+{
+    Py_VISIT(self->md);
+    return 0;
+}
+
+static inline int
+multidict_view_clear(_Multidict_ViewObject *self)
+{
+    Py_CLEAR(self->md);
+    return 0;
+}
+
+static inline Py_ssize_t
+multidict_view_len(_Multidict_ViewObject *self)
+{
+    return pair_list_len(&((MultiDictObject*)self->md)->pairs);
+}
+
+static inline PyObject *
+multidict_view_richcompare(PyObject *self, PyObject *other, int op)
+{
+    PyObject *ret;
+    PyObject *op_obj = PyLong_FromLong(op);
+    if (op_obj == NULL) {
+        return NULL;
+    }
+    ret = PyObject_CallFunctionObjArgs(
+        viewbaseset_richcmp_func, self, other, op_obj, NULL);
+    Py_DECREF(op_obj);
+    return ret;
+}
+
+static inline PyObject *
+multidict_view_and(PyObject *self, PyObject *other)
+{
+    return PyObject_CallFunctionObjArgs(
+        viewbaseset_and_func, self, other, NULL);
+}
+
+static inline PyObject *
+multidict_view_or(PyObject *self, PyObject *other)
+{
+    return PyObject_CallFunctionObjArgs(
+        viewbaseset_or_func, self, other, NULL);
+}
+
+static inline PyObject *
+multidict_view_sub(PyObject *self, PyObject *other)
+{
+    return PyObject_CallFunctionObjArgs(
+        viewbaseset_sub_func, self, other, NULL);
+}
+
+static inline PyObject *
+multidict_view_xor(PyObject *self, PyObject *other)
+{
+    return PyObject_CallFunctionObjArgs(
+        viewbaseset_xor_func, self, other, NULL);
+}
+
+static PyNumberMethods multidict_view_as_number = {
+    .nb_subtract = (binaryfunc)multidict_view_sub,
+    .nb_and = (binaryfunc)multidict_view_and,
+    .nb_xor = (binaryfunc)multidict_view_xor,
+    .nb_or = (binaryfunc)multidict_view_or,
+};
+
+/********** Items **********/
+
+static inline PyObject *
+multidict_itemsview_new(PyObject *md)
+{
+    _Multidict_ViewObject *mv = PyObject_GC_New(
+        _Multidict_ViewObject, &multidict_itemsview_type);
+    if (mv == NULL) {
+        return NULL;
+    }
+
+    _init_view(mv, md);
+
+    PyObject_GC_Track(mv);
+    return (PyObject *)mv;
+}
+
+static inline PyObject *
+multidict_itemsview_iter(_Multidict_ViewObject *self)
+{
+    return multidict_items_iter_new((MultiDictObject*)self->md);
+}
+
+static inline PyObject *
+multidict_itemsview_repr(_Multidict_ViewObject *self)
+{
+    return PyObject_CallFunctionObjArgs(
+        itemsview_repr_func, self, NULL);
+}
+
+static inline PyObject *
+multidict_itemsview_isdisjoint(_Multidict_ViewObject *self, PyObject *other)
+{
+    return PyObject_CallFunctionObjArgs(
+        itemsview_isdisjoint_func, self, other, NULL);
+}
+
+PyDoc_STRVAR(itemsview_isdisjoint_doc,
+             "Return True if two sets have a null intersection.");
+
+static PyMethodDef multidict_itemsview_methods[] = {
+    {
+        "isdisjoint",
+        (PyCFunction)multidict_itemsview_isdisjoint,
+        METH_O,
+        itemsview_isdisjoint_doc
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+static inline int
+multidict_itemsview_contains(_Multidict_ViewObject *self, PyObject *obj)
+{
+    PyObject *akey  = NULL,
+             *aval  = NULL,
+             *bkey  = NULL,
+             *bval  = NULL,
+             *iter  = NULL,
+             *item  = NULL;
+    int ret1, ret2;
+
+    if (!PyTuple_Check(obj) || PyTuple_GET_SIZE(obj) != 2) {
+        return 0;
+    }
+
+    bkey = PyTuple_GET_ITEM(obj, 0);
+    bval = PyTuple_GET_ITEM(obj, 1);
+
+    iter = multidict_itemsview_iter(self);
+    if (iter == NULL) {
+        return 0;
+    }
+
+    while ((item = PyIter_Next(iter)) != NULL) {
+        akey = PyTuple_GET_ITEM(item, 0);
+        aval = PyTuple_GET_ITEM(item, 1);
+
+        ret1 = PyObject_RichCompareBool(akey, bkey, Py_EQ);
+        if (ret1 < 0) {
+            Py_DECREF(iter);
+            Py_DECREF(item);
+            return -1;
+        }
+        ret2 = PyObject_RichCompareBool(aval, bval, Py_EQ);
+        if (ret2 < 0) {
+            Py_DECREF(iter);
+            Py_DECREF(item);
+            return -1;
+        }
+        if (ret1 > 0 && ret2 > 0)
+        {
+            Py_DECREF(iter);
+            Py_DECREF(item);
+            return 1;
+        }
+
+        Py_DECREF(item);
+    }
+
+    Py_DECREF(iter);
+
+    if (PyErr_Occurred()) {
+        return -1;
+    }
+
+    return 0;
+}
+
+static PySequenceMethods multidict_itemsview_as_sequence = {
+    .sq_length = (lenfunc)multidict_view_len,
+    .sq_contains = (objobjproc)multidict_itemsview_contains,
+};
+
+static PyTypeObject multidict_itemsview_type = {
+    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
+    "multidict._multidict._ItemsView",              /* tp_name */
+    sizeof(_Multidict_ViewObject),                  /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_view_dealloc,
+    .tp_repr = (reprfunc)multidict_itemsview_repr,
+    .tp_as_number = &multidict_view_as_number,
+    .tp_as_sequence = &multidict_itemsview_as_sequence,
+    .tp_getattro = PyObject_GenericGetAttr,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+    .tp_traverse = (traverseproc)multidict_view_traverse,
+    .tp_clear = (inquiry)multidict_view_clear,
+    .tp_richcompare = multidict_view_richcompare,
+    .tp_iter = (getiterfunc)multidict_itemsview_iter,
+    .tp_methods = multidict_itemsview_methods,
+};
+
+
+/********** Keys **********/
+
+static inline PyObject *
+multidict_keysview_new(PyObject *md)
+{
+    _Multidict_ViewObject *mv = PyObject_GC_New(
+        _Multidict_ViewObject, &multidict_keysview_type);
+    if (mv == NULL) {
+        return NULL;
+    }
+
+    _init_view(mv, md);
+
+    PyObject_GC_Track(mv);
+    return (PyObject *)mv;
+}
+
+static inline PyObject *
+multidict_keysview_iter(_Multidict_ViewObject *self)
+{
+    return multidict_keys_iter_new(((MultiDictObject*)self->md));
+}
+
+static inline PyObject *
+multidict_keysview_repr(_Multidict_ViewObject *self)
+{
+    return PyObject_CallFunctionObjArgs(
+        keysview_repr_func, self, NULL);
+}
+
+static inline PyObject *
+multidict_keysview_isdisjoint(_Multidict_ViewObject *self, PyObject *other)
+{
+    return PyObject_CallFunctionObjArgs(
+        keysview_isdisjoint_func, self, other, NULL);
+}
+
+PyDoc_STRVAR(keysview_isdisjoint_doc,
+             "Return True if two sets have a null intersection.");
+
+static PyMethodDef multidict_keysview_methods[] = {
+    {
+        "isdisjoint",
+        (PyCFunction)multidict_keysview_isdisjoint,
+        METH_O,
+        keysview_isdisjoint_doc
+    },
+    {
+        NULL,
+        NULL
+    }   /* sentinel */
+};
+
+static inline int
+multidict_keysview_contains(_Multidict_ViewObject *self, PyObject *key)
+{
+    return pair_list_contains(&((MultiDictObject*)self->md)->pairs, key);
+}
+
+static PySequenceMethods multidict_keysview_as_sequence = {
+    .sq_length = (lenfunc)multidict_view_len,
+    .sq_contains = (objobjproc)multidict_keysview_contains,
+};
+
+static PyTypeObject multidict_keysview_type = {
+    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
+    "multidict._multidict._KeysView",              /* tp_name */
+    sizeof(_Multidict_ViewObject),                 /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_view_dealloc,
+    .tp_repr = (reprfunc)multidict_keysview_repr,
+    .tp_as_number = &multidict_view_as_number,
+    .tp_as_sequence = &multidict_keysview_as_sequence,
+    .tp_getattro = PyObject_GenericGetAttr,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+    .tp_traverse = (traverseproc)multidict_view_traverse,
+    .tp_clear = (inquiry)multidict_view_clear,
+    .tp_richcompare = multidict_view_richcompare,
+    .tp_iter = (getiterfunc)multidict_keysview_iter,
+    .tp_methods = multidict_keysview_methods,
+};
+
+
+/********** Values **********/
+
+static inline PyObject *
+multidict_valuesview_new(PyObject *md)
+{
+    _Multidict_ViewObject *mv = PyObject_GC_New(
+        _Multidict_ViewObject, &multidict_valuesview_type);
+    if (mv == NULL) {
+        return NULL;
+    }
+
+    _init_view(mv, md);
+
+    PyObject_GC_Track(mv);
+    return (PyObject *)mv;
+}
+
+static inline PyObject *
+multidict_valuesview_iter(_Multidict_ViewObject *self)
+{
+    return multidict_values_iter_new(((MultiDictObject*)self->md));
+}
+
+static inline PyObject *
+multidict_valuesview_repr(_Multidict_ViewObject *self)
+{
+    return PyObject_CallFunctionObjArgs(
+        valuesview_repr_func, self, NULL);
+}
+
+static PySequenceMethods multidict_valuesview_as_sequence = {
+    .sq_length = (lenfunc)multidict_view_len,
+};
+
+static PyTypeObject multidict_valuesview_type = {
+    PyVarObject_HEAD_INIT(DEFERRED_ADDRESS(&PyType_Type), 0)
+    "multidict._multidict._ValuesView",              /* tp_name */
+    sizeof(_Multidict_ViewObject),                   /* tp_basicsize */
+    .tp_dealloc = (destructor)multidict_view_dealloc,
+    .tp_repr = (reprfunc)multidict_valuesview_repr,
+    .tp_as_sequence = &multidict_valuesview_as_sequence,
+    .tp_getattro = PyObject_GenericGetAttr,
+    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
+    .tp_traverse = (traverseproc)multidict_view_traverse,
+    .tp_clear = (inquiry)multidict_view_clear,
+    .tp_iter = (getiterfunc)multidict_valuesview_iter,
+};
+
+
+static inline int
+multidict_views_init()
+{
+    PyObject *reg_func_call_result = NULL;
+    PyObject *module = PyImport_ImportModule("multidict._multidict_base");
+    if (module == NULL) {
+        goto fail;
+    }
+
+#define GET_MOD_ATTR(VAR, NAME)                 \
+    VAR = PyObject_GetAttrString(module, NAME); \
+    if (VAR == NULL) {                          \
+        goto fail;                              \
+    }
+
+    GET_MOD_ATTR(viewbaseset_richcmp_func, "_viewbaseset_richcmp");
+    GET_MOD_ATTR(viewbaseset_and_func, "_viewbaseset_and");
+    GET_MOD_ATTR(viewbaseset_or_func, "_viewbaseset_or");
+    GET_MOD_ATTR(viewbaseset_sub_func, "_viewbaseset_sub");
+    GET_MOD_ATTR(viewbaseset_xor_func, "_viewbaseset_xor");
+
+    GET_MOD_ATTR(abc_itemsview_register_func, "_abc_itemsview_register");
+    GET_MOD_ATTR(abc_keysview_register_func, "_abc_keysview_register");
+    GET_MOD_ATTR(abc_valuesview_register_func, "_abc_valuesview_register");
+
+    GET_MOD_ATTR(itemsview_repr_func, "_itemsview_isdisjoint");
+    GET_MOD_ATTR(itemsview_repr_func, "_itemsview_repr");
+
+    GET_MOD_ATTR(keysview_repr_func, "_keysview_repr");
+    GET_MOD_ATTR(keysview_isdisjoint_func, "_keysview_isdisjoint");
+
+    GET_MOD_ATTR(valuesview_repr_func, "_valuesview_repr");
+
+    if (PyType_Ready(&multidict_itemsview_type) < 0 ||
+        PyType_Ready(&multidict_valuesview_type) < 0 ||
+        PyType_Ready(&multidict_keysview_type) < 0)
+    {
+        goto fail;
+    }
+
+    // abc.ItemsView.register(_ItemsView)
+    reg_func_call_result = PyObject_CallFunctionObjArgs(
+        abc_itemsview_register_func, (PyObject*)&multidict_itemsview_type, NULL);
+    if (reg_func_call_result == NULL) {
+        goto fail;
+    }
+    Py_DECREF(reg_func_call_result);
+
+    // abc.KeysView.register(_KeysView)
+    reg_func_call_result = PyObject_CallFunctionObjArgs(
+        abc_keysview_register_func, (PyObject*)&multidict_keysview_type, NULL);
+    if (reg_func_call_result == NULL) {
+        goto fail;
+    }
+    Py_DECREF(reg_func_call_result);
+
+    // abc.ValuesView.register(_KeysView)
+    reg_func_call_result = PyObject_CallFunctionObjArgs(
+        abc_valuesview_register_func, (PyObject*)&multidict_valuesview_type, NULL);
+    if (reg_func_call_result == NULL) {
+        goto fail;
+    }
+    Py_DECREF(reg_func_call_result);
+
+    Py_DECREF(module);
+    return 0;
+
+fail:
+    Py_CLEAR(module);
+    return -1;
+
+#undef GET_MOD_ATTR
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/multidict/py.typed b/multidict/py.typed
new file mode 100644
index 0000000..dfe8cc0
--- /dev/null
+++ b/multidict/py.typed
@@ -0,0 +1 @@
+PEP-561 marker.
\ No newline at end of file
diff --git a/typing_extensions.py b/typing_extensions.py
new file mode 100644
index 0000000..6ae0c34
--- /dev/null
+++ b/typing_extensions.py
@@ -0,0 +1,2312 @@
+import abc
+import collections
+import collections.abc
+import functools
+import inspect
+import operator
+import sys
+import types as _types
+import typing
+import warnings
+
+
+__all__ = [
+    # Super-special typing primitives.
+    'Any',
+    'ClassVar',
+    'Concatenate',
+    'Final',
+    'LiteralString',
+    'ParamSpec',
+    'ParamSpecArgs',
+    'ParamSpecKwargs',
+    'Self',
+    'Type',
+    'TypeVar',
+    'TypeVarTuple',
+    'Unpack',
+
+    # ABCs (from collections.abc).
+    'Awaitable',
+    'AsyncIterator',
+    'AsyncIterable',
+    'Coroutine',
+    'AsyncGenerator',
+    'AsyncContextManager',
+    'ChainMap',
+
+    # Concrete collection types.
+    'ContextManager',
+    'Counter',
+    'Deque',
+    'DefaultDict',
+    'NamedTuple',
+    'OrderedDict',
+    'TypedDict',
+
+    # Structural checks, a.k.a. protocols.
+    'SupportsIndex',
+
+    # One-off things.
+    'Annotated',
+    'assert_never',
+    'assert_type',
+    'clear_overloads',
+    'dataclass_transform',
+    'deprecated',
+    'get_overloads',
+    'final',
+    'get_args',
+    'get_origin',
+    'get_type_hints',
+    'IntVar',
+    'is_typeddict',
+    'Literal',
+    'NewType',
+    'overload',
+    'override',
+    'Protocol',
+    'reveal_type',
+    'runtime',
+    'runtime_checkable',
+    'Text',
+    'TypeAlias',
+    'TypeGuard',
+    'TYPE_CHECKING',
+    'Never',
+    'NoReturn',
+    'Required',
+    'NotRequired',
+]
+
+# for backward compatibility
+PEP_560 = True
+GenericMeta = type
+
+# The functions below are modified copies of typing internal helpers.
+# They are needed by _ProtocolMeta and they provide support for PEP 646.
+
+_marker = object()
+
+
+def _check_generic(cls, parameters, elen=_marker):
+    """Check correct count for parameters of a generic cls (internal helper).
+    This gives a nice error message in case of count mismatch.
+    """
+    if not elen:
+        raise TypeError(f"{cls} is not a generic class")
+    if elen is _marker:
+        if not hasattr(cls, "__parameters__") or not cls.__parameters__:
+            raise TypeError(f"{cls} is not a generic class")
+        elen = len(cls.__parameters__)
+    alen = len(parameters)
+    if alen != elen:
+        if hasattr(cls, "__parameters__"):
+            parameters = [p for p in cls.__parameters__ if not _is_unpack(p)]
+            num_tv_tuples = sum(isinstance(p, TypeVarTuple) for p in parameters)
+            if (num_tv_tuples > 0) and (alen >= elen - num_tv_tuples):
+                return
+        raise TypeError(f"Too {'many' if alen > elen else 'few'} parameters for {cls};"
+                        f" actual {alen}, expected {elen}")
+
+
+if sys.version_info >= (3, 10):
+    def _should_collect_from_parameters(t):
+        return isinstance(
+            t, (typing._GenericAlias, _types.GenericAlias, _types.UnionType)
+        )
+elif sys.version_info >= (3, 9):
+    def _should_collect_from_parameters(t):
+        return isinstance(t, (typing._GenericAlias, _types.GenericAlias))
+else:
+    def _should_collect_from_parameters(t):
+        return isinstance(t, typing._GenericAlias) and not t._special
+
+
+def _collect_type_vars(types, typevar_types=None):
+    """Collect all type variable contained in types in order of
+    first appearance (lexicographic order). For example::
+
+        _collect_type_vars((T, List[S, T])) == (T, S)
+    """
+    if typevar_types is None:
+        typevar_types = typing.TypeVar
+    tvars = []
+    for t in types:
+        if (
+            isinstance(t, typevar_types) and
+            t not in tvars and
+            not _is_unpack(t)
+        ):
+            tvars.append(t)
+        if _should_collect_from_parameters(t):
+            tvars.extend([t for t in t.__parameters__ if t not in tvars])
+    return tuple(tvars)
+
+
+NoReturn = typing.NoReturn
+
+# Some unconstrained type variables.  These are used by the container types.
+# (These are not for export.)
+T = typing.TypeVar('T')  # Any type.
+KT = typing.TypeVar('KT')  # Key type.
+VT = typing.TypeVar('VT')  # Value type.
+T_co = typing.TypeVar('T_co', covariant=True)  # Any type covariant containers.
+T_contra = typing.TypeVar('T_contra', contravariant=True)  # Ditto contravariant.
+
+
+if sys.version_info >= (3, 11):
+    from typing import Any
+else:
+
+    class _AnyMeta(type):
+        def __instancecheck__(self, obj):
+            if self is Any:
+                raise TypeError("typing_extensions.Any cannot be used with isinstance()")
+            return super().__instancecheck__(obj)
+
+        def __repr__(self):
+            if self is Any:
+                return "typing_extensions.Any"
+            return super().__repr__()
+
+    class Any(metaclass=_AnyMeta):
+        """Special type indicating an unconstrained type.
+        - Any is compatible with every type.
+        - Any assumed to have all methods.
+        - All values assumed to be instances of Any.
+        Note that all the above statements are true from the point of view of
+        static type checkers. At runtime, Any should not be used with instance
+        checks.
+        """
+        def __new__(cls, *args, **kwargs):
+            if cls is Any:
+                raise TypeError("Any cannot be instantiated")
+            return super().__new__(cls, *args, **kwargs)
+
+
+ClassVar = typing.ClassVar
+
+# On older versions of typing there is an internal class named "Final".
+# 3.8+
+if hasattr(typing, 'Final') and sys.version_info[:2] >= (3, 7):
+    Final = typing.Final
+# 3.7
+else:
+    class _FinalForm(typing._SpecialForm, _root=True):
+
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+        def __getitem__(self, parameters):
+            item = typing._type_check(parameters,
+                                      f'{self._name} accepts only a single type.')
+            return typing._GenericAlias(self, (item,))
+
+    Final = _FinalForm('Final',
+                       doc="""A special typing construct to indicate that a name
+                       cannot be re-assigned or overridden in a subclass.
+                       For example:
+
+                           MAX_SIZE: Final = 9000
+                           MAX_SIZE += 1  # Error reported by type checker
+
+                           class Connection:
+                               TIMEOUT: Final[int] = 10
+                           class FastConnector(Connection):
+                               TIMEOUT = 1  # Error reported by type checker
+
+                       There is no runtime checking of these properties.""")
+
+if sys.version_info >= (3, 11):
+    final = typing.final
+else:
+    # @final exists in 3.8+, but we backport it for all versions
+    # before 3.11 to keep support for the __final__ attribute.
+    # See https://bugs.python.org/issue46342
+    def final(f):
+        """This decorator can be used to indicate to type checkers that
+        the decorated method cannot be overridden, and decorated class
+        cannot be subclassed. For example:
+
+            class Base:
+                @final
+                def done(self) -> None:
+                    ...
+            class Sub(Base):
+                def done(self) -> None:  # Error reported by type checker
+                    ...
+            @final
+            class Leaf:
+                ...
+            class Other(Leaf):  # Error reported by type checker
+                ...
+
+        There is no runtime checking of these properties. The decorator
+        sets the ``__final__`` attribute to ``True`` on the decorated object
+        to allow runtime introspection.
+        """
+        try:
+            f.__final__ = True
+        except (AttributeError, TypeError):
+            # Skip the attribute silently if it is not writable.
+            # AttributeError happens if the object has __slots__ or a
+            # read-only property, TypeError if it's a builtin class.
+            pass
+        return f
+
+
+def IntVar(name):
+    return typing.TypeVar(name)
+
+
+# 3.8+:
+if hasattr(typing, 'Literal'):
+    Literal = typing.Literal
+# 3.7:
+else:
+    class _LiteralForm(typing._SpecialForm, _root=True):
+
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+        def __getitem__(self, parameters):
+            return typing._GenericAlias(self, parameters)
+
+    Literal = _LiteralForm('Literal',
+                           doc="""A type that can be used to indicate to type checkers
+                           that the corresponding value has a value literally equivalent
+                           to the provided parameter. For example:
+
+                               var: Literal[4] = 4
+
+                           The type checker understands that 'var' is literally equal to
+                           the value 4 and no other value.
+
+                           Literal[...] cannot be subclassed. There is no runtime
+                           checking verifying that the parameter is actually a value
+                           instead of a type.""")
+
+
+_overload_dummy = typing._overload_dummy  # noqa
+
+
+if hasattr(typing, "get_overloads"):  # 3.11+
+    overload = typing.overload
+    get_overloads = typing.get_overloads
+    clear_overloads = typing.clear_overloads
+else:
+    # {module: {qualname: {firstlineno: func}}}
+    _overload_registry = collections.defaultdict(
+        functools.partial(collections.defaultdict, dict)
+    )
+
+    def overload(func):
+        """Decorator for overloaded functions/methods.
+
+        In a stub file, place two or more stub definitions for the same
+        function in a row, each decorated with @overload.  For example:
+
+        @overload
+        def utf8(value: None) -> None: ...
+        @overload
+        def utf8(value: bytes) -> bytes: ...
+        @overload
+        def utf8(value: str) -> bytes: ...
+
+        In a non-stub file (i.e. a regular .py file), do the same but
+        follow it with an implementation.  The implementation should *not*
+        be decorated with @overload.  For example:
+
+        @overload
+        def utf8(value: None) -> None: ...
+        @overload
+        def utf8(value: bytes) -> bytes: ...
+        @overload
+        def utf8(value: str) -> bytes: ...
+        def utf8(value):
+            # implementation goes here
+
+        The overloads for a function can be retrieved at runtime using the
+        get_overloads() function.
+        """
+        # classmethod and staticmethod
+        f = getattr(func, "__func__", func)
+        try:
+            _overload_registry[f.__module__][f.__qualname__][
+                f.__code__.co_firstlineno
+            ] = func
+        except AttributeError:
+            # Not a normal function; ignore.
+            pass
+        return _overload_dummy
+
+    def get_overloads(func):
+        """Return all defined overloads for *func* as a sequence."""
+        # classmethod and staticmethod
+        f = getattr(func, "__func__", func)
+        if f.__module__ not in _overload_registry:
+            return []
+        mod_dict = _overload_registry[f.__module__]
+        if f.__qualname__ not in mod_dict:
+            return []
+        return list(mod_dict[f.__qualname__].values())
+
+    def clear_overloads():
+        """Clear all overloads in the registry."""
+        _overload_registry.clear()
+
+
+# This is not a real generic class.  Don't use outside annotations.
+Type = typing.Type
+
+# Various ABCs mimicking those in collections.abc.
+# A few are simply re-exported for completeness.
+
+
+Awaitable = typing.Awaitable
+Coroutine = typing.Coroutine
+AsyncIterable = typing.AsyncIterable
+AsyncIterator = typing.AsyncIterator
+Deque = typing.Deque
+ContextManager = typing.ContextManager
+AsyncContextManager = typing.AsyncContextManager
+DefaultDict = typing.DefaultDict
+
+# 3.7.2+
+if hasattr(typing, 'OrderedDict'):
+    OrderedDict = typing.OrderedDict
+# 3.7.0-3.7.2
+else:
+    OrderedDict = typing._alias(collections.OrderedDict, (KT, VT))
+
+Counter = typing.Counter
+ChainMap = typing.ChainMap
+AsyncGenerator = typing.AsyncGenerator
+NewType = typing.NewType
+Text = typing.Text
+TYPE_CHECKING = typing.TYPE_CHECKING
+
+
+_PROTO_WHITELIST = ['Callable', 'Awaitable',
+                    'Iterable', 'Iterator', 'AsyncIterable', 'AsyncIterator',
+                    'Hashable', 'Sized', 'Container', 'Collection', 'Reversible',
+                    'ContextManager', 'AsyncContextManager']
+
+
+def _get_protocol_attrs(cls):
+    attrs = set()
+    for base in cls.__mro__[:-1]:  # without object
+        if base.__name__ in ('Protocol', 'Generic'):
+            continue
+        annotations = getattr(base, '__annotations__', {})
+        for attr in list(base.__dict__.keys()) + list(annotations.keys()):
+            if (not attr.startswith('_abc_') and attr not in (
+                    '__abstractmethods__', '__annotations__', '__weakref__',
+                    '_is_protocol', '_is_runtime_protocol', '__dict__',
+                    '__args__', '__slots__',
+                    '__next_in_mro__', '__parameters__', '__origin__',
+                    '__orig_bases__', '__extra__', '__tree_hash__',
+                    '__doc__', '__subclasshook__', '__init__', '__new__',
+                    '__module__', '_MutableMapping__marker', '_gorg')):
+                attrs.add(attr)
+    return attrs
+
+
+def _is_callable_members_only(cls):
+    return all(callable(getattr(cls, attr, None)) for attr in _get_protocol_attrs(cls))
+
+
+def _maybe_adjust_parameters(cls):
+    """Helper function used in Protocol.__init_subclass__ and _TypedDictMeta.__new__.
+
+    The contents of this function are very similar
+    to logic found in typing.Generic.__init_subclass__
+    on the CPython main branch.
+    """
+    tvars = []
+    if '__orig_bases__' in cls.__dict__:
+        tvars = typing._collect_type_vars(cls.__orig_bases__)
+        # Look for Generic[T1, ..., Tn] or Protocol[T1, ..., Tn].
+        # If found, tvars must be a subset of it.
+        # If not found, tvars is it.
+        # Also check for and reject plain Generic,
+        # and reject multiple Generic[...] and/or Protocol[...].
+        gvars = None
+        for base in cls.__orig_bases__:
+            if (isinstance(base, typing._GenericAlias) and
+                    base.__origin__ in (typing.Generic, Protocol)):
+                # for error messages
+                the_base = base.__origin__.__name__
+                if gvars is not None:
+                    raise TypeError(
+                        "Cannot inherit from Generic[...]"
+                        " and/or Protocol[...] multiple types.")
+                gvars = base.__parameters__
+        if gvars is None:
+            gvars = tvars
+        else:
+            tvarset = set(tvars)
+            gvarset = set(gvars)
+            if not tvarset <= gvarset:
+                s_vars = ', '.join(str(t) for t in tvars if t not in gvarset)
+                s_args = ', '.join(str(g) for g in gvars)
+                raise TypeError(f"Some type variables ({s_vars}) are"
+                                f" not listed in {the_base}[{s_args}]")
+            tvars = gvars
+    cls.__parameters__ = tuple(tvars)
+
+
+# 3.8+
+if hasattr(typing, 'Protocol'):
+    Protocol = typing.Protocol
+# 3.7
+else:
+
+    def _no_init(self, *args, **kwargs):
+        if type(self)._is_protocol:
+            raise TypeError('Protocols cannot be instantiated')
+
+    class _ProtocolMeta(abc.ABCMeta):  # noqa: B024
+        # This metaclass is a bit unfortunate and exists only because of the lack
+        # of __instancehook__.
+        def __instancecheck__(cls, instance):
+            # We need this method for situations where attributes are
+            # assigned in __init__.
+            if ((not getattr(cls, '_is_protocol', False) or
+                 _is_callable_members_only(cls)) and
+                    issubclass(instance.__class__, cls)):
+                return True
+            if cls._is_protocol:
+                if all(hasattr(instance, attr) and
+                       (not callable(getattr(cls, attr, None)) or
+                        getattr(instance, attr) is not None)
+                       for attr in _get_protocol_attrs(cls)):
+                    return True
+            return super().__instancecheck__(instance)
+
+    class Protocol(metaclass=_ProtocolMeta):
+        # There is quite a lot of overlapping code with typing.Generic.
+        # Unfortunately it is hard to avoid this while these live in two different
+        # modules. The duplicated code will be removed when Protocol is moved to typing.
+        """Base class for protocol classes. Protocol classes are defined as::
+
+            class Proto(Protocol):
+                def meth(self) -> int:
+                    ...
+
+        Such classes are primarily used with static type checkers that recognize
+        structural subtyping (static duck-typing), for example::
+
+            class C:
+                def meth(self) -> int:
+                    return 0
+
+            def func(x: Proto) -> int:
+                return x.meth()
+
+            func(C())  # Passes static type check
+
+        See PEP 544 for details. Protocol classes decorated with
+        @typing_extensions.runtime act as simple-minded runtime protocol that checks
+        only the presence of given attributes, ignoring their type signatures.
+
+        Protocol classes can be generic, they are defined as::
+
+            class GenProto(Protocol[T]):
+                def meth(self) -> T:
+                    ...
+        """
+        __slots__ = ()
+        _is_protocol = True
+
+        def __new__(cls, *args, **kwds):
+            if cls is Protocol:
+                raise TypeError("Type Protocol cannot be instantiated; "
+                                "it can only be used as a base class")
+            return super().__new__(cls)
+
+        @typing._tp_cache
+        def __class_getitem__(cls, params):
+            if not isinstance(params, tuple):
+                params = (params,)
+            if not params and cls is not typing.Tuple:
+                raise TypeError(
+                    f"Parameter list to {cls.__qualname__}[...] cannot be empty")
+            msg = "Parameters to generic types must be types."
+            params = tuple(typing._type_check(p, msg) for p in params)  # noqa
+            if cls is Protocol:
+                # Generic can only be subscripted with unique type variables.
+                if not all(isinstance(p, typing.TypeVar) for p in params):
+                    i = 0
+                    while isinstance(params[i], typing.TypeVar):
+                        i += 1
+                    raise TypeError(
+                        "Parameters to Protocol[...] must all be type variables."
+                        f" Parameter {i + 1} is {params[i]}")
+                if len(set(params)) != len(params):
+                    raise TypeError(
+                        "Parameters to Protocol[...] must all be unique")
+            else:
+                # Subscripting a regular Generic subclass.
+                _check_generic(cls, params, len(cls.__parameters__))
+            return typing._GenericAlias(cls, params)
+
+        def __init_subclass__(cls, *args, **kwargs):
+            if '__orig_bases__' in cls.__dict__:
+                error = typing.Generic in cls.__orig_bases__
+            else:
+                error = typing.Generic in cls.__bases__
+            if error:
+                raise TypeError("Cannot inherit from plain Generic")
+            _maybe_adjust_parameters(cls)
+
+            # Determine if this is a protocol or a concrete subclass.
+            if not cls.__dict__.get('_is_protocol', None):
+                cls._is_protocol = any(b is Protocol for b in cls.__bases__)
+
+            # Set (or override) the protocol subclass hook.
+            def _proto_hook(other):
+                if not cls.__dict__.get('_is_protocol', None):
+                    return NotImplemented
+                if not getattr(cls, '_is_runtime_protocol', False):
+                    if sys._getframe(2).f_globals['__name__'] in ['abc', 'functools']:
+                        return NotImplemented
+                    raise TypeError("Instance and class checks can only be used with"
+                                    " @runtime protocols")
+                if not _is_callable_members_only(cls):
+                    if sys._getframe(2).f_globals['__name__'] in ['abc', 'functools']:
+                        return NotImplemented
+                    raise TypeError("Protocols with non-method members"
+                                    " don't support issubclass()")
+                if not isinstance(other, type):
+                    # Same error as for issubclass(1, int)
+                    raise TypeError('issubclass() arg 1 must be a class')
+                for attr in _get_protocol_attrs(cls):
+                    for base in other.__mro__:
+                        if attr in base.__dict__:
+                            if base.__dict__[attr] is None:
+                                return NotImplemented
+                            break
+                        annotations = getattr(base, '__annotations__', {})
+                        if (isinstance(annotations, typing.Mapping) and
+                                attr in annotations and
+                                isinstance(other, _ProtocolMeta) and
+                                other._is_protocol):
+                            break
+                    else:
+                        return NotImplemented
+                return True
+            if '__subclasshook__' not in cls.__dict__:
+                cls.__subclasshook__ = _proto_hook
+
+            # We have nothing more to do for non-protocols.
+            if not cls._is_protocol:
+                return
+
+            # Check consistency of bases.
+            for base in cls.__bases__:
+                if not (base in (object, typing.Generic) or
+                        base.__module__ == 'collections.abc' and
+                        base.__name__ in _PROTO_WHITELIST or
+                        isinstance(base, _ProtocolMeta) and base._is_protocol):
+                    raise TypeError('Protocols can only inherit from other'
+                                    f' protocols, got {repr(base)}')
+            cls.__init__ = _no_init
+
+
+# 3.8+
+if hasattr(typing, 'runtime_checkable'):
+    runtime_checkable = typing.runtime_checkable
+# 3.7
+else:
+    def runtime_checkable(cls):
+        """Mark a protocol class as a runtime protocol, so that it
+        can be used with isinstance() and issubclass(). Raise TypeError
+        if applied to a non-protocol class.
+
+        This allows a simple-minded structural check very similar to the
+        one-offs in collections.abc such as Hashable.
+        """
+        if not isinstance(cls, _ProtocolMeta) or not cls._is_protocol:
+            raise TypeError('@runtime_checkable can be only applied to protocol classes,'
+                            f' got {cls!r}')
+        cls._is_runtime_protocol = True
+        return cls
+
+
+# Exists for backwards compatibility.
+runtime = runtime_checkable
+
+
+# 3.8+
+if hasattr(typing, 'SupportsIndex'):
+    SupportsIndex = typing.SupportsIndex
+# 3.7
+else:
+    @runtime_checkable
+    class SupportsIndex(Protocol):
+        __slots__ = ()
+
+        @abc.abstractmethod
+        def __index__(self) -> int:
+            pass
+
+
+if hasattr(typing, "Required"):
+    # The standard library TypedDict in Python 3.8 does not store runtime information
+    # about which (if any) keys are optional.  See https://bugs.python.org/issue38834
+    # The standard library TypedDict in Python 3.9.0/1 does not honour the "total"
+    # keyword with old-style TypedDict().  See https://bugs.python.org/issue42059
+    # The standard library TypedDict below Python 3.11 does not store runtime
+    # information about optional and required keys when using Required or NotRequired.
+    # Generic TypedDicts are also impossible using typing.TypedDict on Python <3.11.
+    TypedDict = typing.TypedDict
+    _TypedDictMeta = typing._TypedDictMeta
+    is_typeddict = typing.is_typeddict
+else:
+    def _check_fails(cls, other):
+        try:
+            if sys._getframe(1).f_globals['__name__'] not in ['abc',
+                                                              'functools',
+                                                              'typing']:
+                # Typed dicts are only for static structural subtyping.
+                raise TypeError('TypedDict does not support instance and class checks')
+        except (AttributeError, ValueError):
+            pass
+        return False
+
+    def _dict_new(*args, **kwargs):
+        if not args:
+            raise TypeError('TypedDict.__new__(): not enough arguments')
+        _, args = args[0], args[1:]  # allow the "cls" keyword be passed
+        return dict(*args, **kwargs)
+
+    _dict_new.__text_signature__ = '($cls, _typename, _fields=None, /, **kwargs)'
+
+    def _typeddict_new(*args, total=True, **kwargs):
+        if not args:
+            raise TypeError('TypedDict.__new__(): not enough arguments')
+        _, args = args[0], args[1:]  # allow the "cls" keyword be passed
+        if args:
+            typename, args = args[0], args[1:]  # allow the "_typename" keyword be passed
+        elif '_typename' in kwargs:
+            typename = kwargs.pop('_typename')
+            import warnings
+            warnings.warn("Passing '_typename' as keyword argument is deprecated",
+                          DeprecationWarning, stacklevel=2)
+        else:
+            raise TypeError("TypedDict.__new__() missing 1 required positional "
+                            "argument: '_typename'")
+        if args:
+            try:
+                fields, = args  # allow the "_fields" keyword be passed
+            except ValueError:
+                raise TypeError('TypedDict.__new__() takes from 2 to 3 '
+                                f'positional arguments but {len(args) + 2} '
+                                'were given')
+        elif '_fields' in kwargs and len(kwargs) == 1:
+            fields = kwargs.pop('_fields')
+            import warnings
+            warnings.warn("Passing '_fields' as keyword argument is deprecated",
+                          DeprecationWarning, stacklevel=2)
+        else:
+            fields = None
+
+        if fields is None:
+            fields = kwargs
+        elif kwargs:
+            raise TypeError("TypedDict takes either a dict or keyword arguments,"
+                            " but not both")
+
+        ns = {'__annotations__': dict(fields)}
+        try:
+            # Setting correct module is necessary to make typed dict classes pickleable.
+            ns['__module__'] = sys._getframe(1).f_globals.get('__name__', '__main__')
+        except (AttributeError, ValueError):
+            pass
+
+        return _TypedDictMeta(typename, (), ns, total=total)
+
+    _typeddict_new.__text_signature__ = ('($cls, _typename, _fields=None,'
+                                         ' /, *, total=True, **kwargs)')
+
+    _TAKES_MODULE = "module" in inspect.signature(typing._type_check).parameters
+
+    class _TypedDictMeta(type):
+        def __init__(cls, name, bases, ns, total=True):
+            super().__init__(name, bases, ns)
+
+        def __new__(cls, name, bases, ns, total=True):
+            # Create new typed dict class object.
+            # This method is called directly when TypedDict is subclassed,
+            # or via _typeddict_new when TypedDict is instantiated. This way
+            # TypedDict supports all three syntaxes described in its docstring.
+            # Subclasses and instances of TypedDict return actual dictionaries
+            # via _dict_new.
+            ns['__new__'] = _typeddict_new if name == 'TypedDict' else _dict_new
+            # Don't insert typing.Generic into __bases__ here,
+            # or Generic.__init_subclass__ will raise TypeError
+            # in the super().__new__() call.
+            # Instead, monkey-patch __bases__ onto the class after it's been created.
+            tp_dict = super().__new__(cls, name, (dict,), ns)
+
+            if any(issubclass(base, typing.Generic) for base in bases):
+                tp_dict.__bases__ = (typing.Generic, dict)
+                _maybe_adjust_parameters(tp_dict)
+
+            annotations = {}
+            own_annotations = ns.get('__annotations__', {})
+            msg = "TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a type"
+            kwds = {"module": tp_dict.__module__} if _TAKES_MODULE else {}
+            own_annotations = {
+                n: typing._type_check(tp, msg, **kwds)
+                for n, tp in own_annotations.items()
+            }
+            required_keys = set()
+            optional_keys = set()
+
+            for base in bases:
+                annotations.update(base.__dict__.get('__annotations__', {}))
+                required_keys.update(base.__dict__.get('__required_keys__', ()))
+                optional_keys.update(base.__dict__.get('__optional_keys__', ()))
+
+            annotations.update(own_annotations)
+            for annotation_key, annotation_type in own_annotations.items():
+                annotation_origin = get_origin(annotation_type)
+                if annotation_origin is Annotated:
+                    annotation_args = get_args(annotation_type)
+                    if annotation_args:
+                        annotation_type = annotation_args[0]
+                        annotation_origin = get_origin(annotation_type)
+
+                if annotation_origin is Required:
+                    required_keys.add(annotation_key)
+                elif annotation_origin is NotRequired:
+                    optional_keys.add(annotation_key)
+                elif total:
+                    required_keys.add(annotation_key)
+                else:
+                    optional_keys.add(annotation_key)
+
+            tp_dict.__annotations__ = annotations
+            tp_dict.__required_keys__ = frozenset(required_keys)
+            tp_dict.__optional_keys__ = frozenset(optional_keys)
+            if not hasattr(tp_dict, '__total__'):
+                tp_dict.__total__ = total
+            return tp_dict
+
+        __instancecheck__ = __subclasscheck__ = _check_fails
+
+    TypedDict = _TypedDictMeta('TypedDict', (dict,), {})
+    TypedDict.__module__ = __name__
+    TypedDict.__doc__ = \
+        """A simple typed name space. At runtime it is equivalent to a plain dict.
+
+        TypedDict creates a dictionary type that expects all of its
+        instances to have a certain set of keys, with each key
+        associated with a value of a consistent type. This expectation
+        is not checked at runtime but is only enforced by type checkers.
+        Usage::
+
+            class Point2D(TypedDict):
+                x: int
+                y: int
+                label: str
+
+            a: Point2D = {'x': 1, 'y': 2, 'label': 'good'}  # OK
+            b: Point2D = {'z': 3, 'label': 'bad'}           # Fails type check
+
+            assert Point2D(x=1, y=2, label='first') == dict(x=1, y=2, label='first')
+
+        The type info can be accessed via the Point2D.__annotations__ dict, and
+        the Point2D.__required_keys__ and Point2D.__optional_keys__ frozensets.
+        TypedDict supports two additional equivalent forms::
+
+            Point2D = TypedDict('Point2D', x=int, y=int, label=str)
+            Point2D = TypedDict('Point2D', {'x': int, 'y': int, 'label': str})
+
+        The class syntax is only supported in Python 3.6+, while two other
+        syntax forms work for Python 2.7 and 3.2+
+        """
+
+    if hasattr(typing, "_TypedDictMeta"):
+        _TYPEDDICT_TYPES = (typing._TypedDictMeta, _TypedDictMeta)
+    else:
+        _TYPEDDICT_TYPES = (_TypedDictMeta,)
+
+    def is_typeddict(tp):
+        """Check if an annotation is a TypedDict class
+
+        For example::
+            class Film(TypedDict):
+                title: str
+                year: int
+
+            is_typeddict(Film)  # => True
+            is_typeddict(Union[list, str])  # => False
+        """
+        return isinstance(tp, tuple(_TYPEDDICT_TYPES))
+
+
+if hasattr(typing, "assert_type"):
+    assert_type = typing.assert_type
+
+else:
+    def assert_type(__val, __typ):
+        """Assert (to the type checker) that the value is of the given type.
+
+        When the type checker encounters a call to assert_type(), it
+        emits an error if the value is not of the specified type::
+
+            def greet(name: str) -> None:
+                assert_type(name, str)  # ok
+                assert_type(name, int)  # type checker error
+
+        At runtime this returns the first argument unchanged and otherwise
+        does nothing.
+        """
+        return __val
+
+
+if hasattr(typing, "Required"):
+    get_type_hints = typing.get_type_hints
+else:
+    import functools
+    import types
+
+    # replaces _strip_annotations()
+    def _strip_extras(t):
+        """Strips Annotated, Required and NotRequired from a given type."""
+        if isinstance(t, _AnnotatedAlias):
+            return _strip_extras(t.__origin__)
+        if hasattr(t, "__origin__") and t.__origin__ in (Required, NotRequired):
+            return _strip_extras(t.__args__[0])
+        if isinstance(t, typing._GenericAlias):
+            stripped_args = tuple(_strip_extras(a) for a in t.__args__)
+            if stripped_args == t.__args__:
+                return t
+            return t.copy_with(stripped_args)
+        if hasattr(types, "GenericAlias") and isinstance(t, types.GenericAlias):
+            stripped_args = tuple(_strip_extras(a) for a in t.__args__)
+            if stripped_args == t.__args__:
+                return t
+            return types.GenericAlias(t.__origin__, stripped_args)
+        if hasattr(types, "UnionType") and isinstance(t, types.UnionType):
+            stripped_args = tuple(_strip_extras(a) for a in t.__args__)
+            if stripped_args == t.__args__:
+                return t
+            return functools.reduce(operator.or_, stripped_args)
+
+        return t
+
+    def get_type_hints(obj, globalns=None, localns=None, include_extras=False):
+        """Return type hints for an object.
+
+        This is often the same as obj.__annotations__, but it handles
+        forward references encoded as string literals, adds Optional[t] if a
+        default value equal to None is set and recursively replaces all
+        'Annotated[T, ...]', 'Required[T]' or 'NotRequired[T]' with 'T'
+        (unless 'include_extras=True').
+
+        The argument may be a module, class, method, or function. The annotations
+        are returned as a dictionary. For classes, annotations include also
+        inherited members.
+
+        TypeError is raised if the argument is not of a type that can contain
+        annotations, and an empty dictionary is returned if no annotations are
+        present.
+
+        BEWARE -- the behavior of globalns and localns is counterintuitive
+        (unless you are familiar with how eval() and exec() work).  The
+        search order is locals first, then globals.
+
+        - If no dict arguments are passed, an attempt is made to use the
+          globals from obj (or the respective module's globals for classes),
+          and these are also used as the locals.  If the object does not appear
+          to have globals, an empty dictionary is used.
+
+        - If one dict argument is passed, it is used for both globals and
+          locals.
+
+        - If two dict arguments are passed, they specify globals and
+          locals, respectively.
+        """
+        if hasattr(typing, "Annotated"):
+            hint = typing.get_type_hints(
+                obj, globalns=globalns, localns=localns, include_extras=True
+            )
+        else:
+            hint = typing.get_type_hints(obj, globalns=globalns, localns=localns)
+        if include_extras:
+            return hint
+        return {k: _strip_extras(t) for k, t in hint.items()}
+
+
+# Python 3.9+ has PEP 593 (Annotated)
+if hasattr(typing, 'Annotated'):
+    Annotated = typing.Annotated
+    # Not exported and not a public API, but needed for get_origin() and get_args()
+    # to work.
+    _AnnotatedAlias = typing._AnnotatedAlias
+# 3.7-3.8
+else:
+    class _AnnotatedAlias(typing._GenericAlias, _root=True):
+        """Runtime representation of an annotated type.
+
+        At its core 'Annotated[t, dec1, dec2, ...]' is an alias for the type 't'
+        with extra annotations. The alias behaves like a normal typing alias,
+        instantiating is the same as instantiating the underlying type, binding
+        it to types is also the same.
+        """
+        def __init__(self, origin, metadata):
+            if isinstance(origin, _AnnotatedAlias):
+                metadata = origin.__metadata__ + metadata
+                origin = origin.__origin__
+            super().__init__(origin, origin)
+            self.__metadata__ = metadata
+
+        def copy_with(self, params):
+            assert len(params) == 1
+            new_type = params[0]
+            return _AnnotatedAlias(new_type, self.__metadata__)
+
+        def __repr__(self):
+            return (f"typing_extensions.Annotated[{typing._type_repr(self.__origin__)}, "
+                    f"{', '.join(repr(a) for a in self.__metadata__)}]")
+
+        def __reduce__(self):
+            return operator.getitem, (
+                Annotated, (self.__origin__,) + self.__metadata__
+            )
+
+        def __eq__(self, other):
+            if not isinstance(other, _AnnotatedAlias):
+                return NotImplemented
+            if self.__origin__ != other.__origin__:
+                return False
+            return self.__metadata__ == other.__metadata__
+
+        def __hash__(self):
+            return hash((self.__origin__, self.__metadata__))
+
+    class Annotated:
+        """Add context specific metadata to a type.
+
+        Example: Annotated[int, runtime_check.Unsigned] indicates to the
+        hypothetical runtime_check module that this type is an unsigned int.
+        Every other consumer of this type can ignore this metadata and treat
+        this type as int.
+
+        The first argument to Annotated must be a valid type (and will be in
+        the __origin__ field), the remaining arguments are kept as a tuple in
+        the __extra__ field.
+
+        Details:
+
+        - It's an error to call `Annotated` with less than two arguments.
+        - Nested Annotated are flattened::
+
+            Annotated[Annotated[T, Ann1, Ann2], Ann3] == Annotated[T, Ann1, Ann2, Ann3]
+
+        - Instantiating an annotated type is equivalent to instantiating the
+        underlying type::
+
+            Annotated[C, Ann1](5) == C(5)
+
+        - Annotated can be used as a generic type alias::
+
+            Optimized = Annotated[T, runtime.Optimize()]
+            Optimized[int] == Annotated[int, runtime.Optimize()]
+
+            OptimizedList = Annotated[List[T], runtime.Optimize()]
+            OptimizedList[int] == Annotated[List[int], runtime.Optimize()]
+        """
+
+        __slots__ = ()
+
+        def __new__(cls, *args, **kwargs):
+            raise TypeError("Type Annotated cannot be instantiated.")
+
+        @typing._tp_cache
+        def __class_getitem__(cls, params):
+            if not isinstance(params, tuple) or len(params) < 2:
+                raise TypeError("Annotated[...] should be used "
+                                "with at least two arguments (a type and an "
+                                "annotation).")
+            allowed_special_forms = (ClassVar, Final)
+            if get_origin(params[0]) in allowed_special_forms:
+                origin = params[0]
+            else:
+                msg = "Annotated[t, ...]: t must be a type."
+                origin = typing._type_check(params[0], msg)
+            metadata = tuple(params[1:])
+            return _AnnotatedAlias(origin, metadata)
+
+        def __init_subclass__(cls, *args, **kwargs):
+            raise TypeError(
+                f"Cannot subclass {cls.__module__}.Annotated"
+            )
+
+# Python 3.8 has get_origin() and get_args() but those implementations aren't
+# Annotated-aware, so we can't use those. Python 3.9's versions don't support
+# ParamSpecArgs and ParamSpecKwargs, so only Python 3.10's versions will do.
+if sys.version_info[:2] >= (3, 10):
+    get_origin = typing.get_origin
+    get_args = typing.get_args
+# 3.7-3.9
+else:
+    try:
+        # 3.9+
+        from typing import _BaseGenericAlias
+    except ImportError:
+        _BaseGenericAlias = typing._GenericAlias
+    try:
+        # 3.9+
+        from typing import GenericAlias as _typing_GenericAlias
+    except ImportError:
+        _typing_GenericAlias = typing._GenericAlias
+
+    def get_origin(tp):
+        """Get the unsubscripted version of a type.
+
+        This supports generic types, Callable, Tuple, Union, Literal, Final, ClassVar
+        and Annotated. Return None for unsupported types. Examples::
+
+            get_origin(Literal[42]) is Literal
+            get_origin(int) is None
+            get_origin(ClassVar[int]) is ClassVar
+            get_origin(Generic) is Generic
+            get_origin(Generic[T]) is Generic
+            get_origin(Union[T, int]) is Union
+            get_origin(List[Tuple[T, T]][int]) == list
+            get_origin(P.args) is P
+        """
+        if isinstance(tp, _AnnotatedAlias):
+            return Annotated
+        if isinstance(tp, (typing._GenericAlias, _typing_GenericAlias, _BaseGenericAlias,
+                           ParamSpecArgs, ParamSpecKwargs)):
+            return tp.__origin__
+        if tp is typing.Generic:
+            return typing.Generic
+        return None
+
+    def get_args(tp):
+        """Get type arguments with all substitutions performed.
+
+        For unions, basic simplifications used by Union constructor are performed.
+        Examples::
+            get_args(Dict[str, int]) == (str, int)
+            get_args(int) == ()
+            get_args(Union[int, Union[T, int], str][int]) == (int, str)
+            get_args(Union[int, Tuple[T, int]][str]) == (int, Tuple[str, int])
+            get_args(Callable[[], T][int]) == ([], int)
+        """
+        if isinstance(tp, _AnnotatedAlias):
+            return (tp.__origin__,) + tp.__metadata__
+        if isinstance(tp, (typing._GenericAlias, _typing_GenericAlias)):
+            if getattr(tp, "_special", False):
+                return ()
+            res = tp.__args__
+            if get_origin(tp) is collections.abc.Callable and res[0] is not Ellipsis:
+                res = (list(res[:-1]), res[-1])
+            return res
+        return ()
+
+
+# 3.10+
+if hasattr(typing, 'TypeAlias'):
+    TypeAlias = typing.TypeAlias
+# 3.9
+elif sys.version_info[:2] >= (3, 9):
+    class _TypeAliasForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+    @_TypeAliasForm
+    def TypeAlias(self, parameters):
+        """Special marker indicating that an assignment should
+        be recognized as a proper type alias definition by type
+        checkers.
+
+        For example::
+
+            Predicate: TypeAlias = Callable[..., bool]
+
+        It's invalid when used anywhere except as in the example above.
+        """
+        raise TypeError(f"{self} is not subscriptable")
+# 3.7-3.8
+else:
+    class _TypeAliasForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+    TypeAlias = _TypeAliasForm('TypeAlias',
+                               doc="""Special marker indicating that an assignment should
+                               be recognized as a proper type alias definition by type
+                               checkers.
+
+                               For example::
+
+                                   Predicate: TypeAlias = Callable[..., bool]
+
+                               It's invalid when used anywhere except as in the example
+                               above.""")
+
+
+class _DefaultMixin:
+    """Mixin for TypeVarLike defaults."""
+
+    __slots__ = ()
+
+    def __init__(self, default):
+        if isinstance(default, (tuple, list)):
+            self.__default__ = tuple((typing._type_check(d, "Default must be a type")
+                                      for d in default))
+        elif default != _marker:
+            self.__default__ = typing._type_check(default, "Default must be a type")
+        else:
+            self.__default__ = None
+
+
+# Add default and infer_variance parameters from PEP 696 and 695
+class TypeVar(typing.TypeVar, _DefaultMixin, _root=True):
+    """Type variable."""
+
+    __module__ = 'typing'
+
+    def __init__(self, name, *constraints, bound=None,
+                 covariant=False, contravariant=False,
+                 default=_marker, infer_variance=False):
+        super().__init__(name, *constraints, bound=bound, covariant=covariant,
+                         contravariant=contravariant)
+        _DefaultMixin.__init__(self, default)
+        self.__infer_variance__ = infer_variance
+
+        # for pickling:
+        try:
+            def_mod = sys._getframe(1).f_globals.get('__name__', '__main__')
+        except (AttributeError, ValueError):
+            def_mod = None
+        if def_mod != 'typing_extensions':
+            self.__module__ = def_mod
+
+
+# Python 3.10+ has PEP 612
+if hasattr(typing, 'ParamSpecArgs'):
+    ParamSpecArgs = typing.ParamSpecArgs
+    ParamSpecKwargs = typing.ParamSpecKwargs
+# 3.7-3.9
+else:
+    class _Immutable:
+        """Mixin to indicate that object should not be copied."""
+        __slots__ = ()
+
+        def __copy__(self):
+            return self
+
+        def __deepcopy__(self, memo):
+            return self
+
+    class ParamSpecArgs(_Immutable):
+        """The args for a ParamSpec object.
+
+        Given a ParamSpec object P, P.args is an instance of ParamSpecArgs.
+
+        ParamSpecArgs objects have a reference back to their ParamSpec:
+
+        P.args.__origin__ is P
+
+        This type is meant for runtime introspection and has no special meaning to
+        static type checkers.
+        """
+        def __init__(self, origin):
+            self.__origin__ = origin
+
+        def __repr__(self):
+            return f"{self.__origin__.__name__}.args"
+
+        def __eq__(self, other):
+            if not isinstance(other, ParamSpecArgs):
+                return NotImplemented
+            return self.__origin__ == other.__origin__
+
+    class ParamSpecKwargs(_Immutable):
+        """The kwargs for a ParamSpec object.
+
+        Given a ParamSpec object P, P.kwargs is an instance of ParamSpecKwargs.
+
+        ParamSpecKwargs objects have a reference back to their ParamSpec:
+
+        P.kwargs.__origin__ is P
+
+        This type is meant for runtime introspection and has no special meaning to
+        static type checkers.
+        """
+        def __init__(self, origin):
+            self.__origin__ = origin
+
+        def __repr__(self):
+            return f"{self.__origin__.__name__}.kwargs"
+
+        def __eq__(self, other):
+            if not isinstance(other, ParamSpecKwargs):
+                return NotImplemented
+            return self.__origin__ == other.__origin__
+
+# 3.10+
+if hasattr(typing, 'ParamSpec'):
+
+    # Add default Parameter - PEP 696
+    class ParamSpec(typing.ParamSpec, _DefaultMixin, _root=True):
+        """Parameter specification variable."""
+
+        __module__ = 'typing'
+
+        def __init__(self, name, *, bound=None, covariant=False, contravariant=False,
+                     default=_marker):
+            super().__init__(name, bound=bound, covariant=covariant,
+                             contravariant=contravariant)
+            _DefaultMixin.__init__(self, default)
+
+            # for pickling:
+            try:
+                def_mod = sys._getframe(1).f_globals.get('__name__', '__main__')
+            except (AttributeError, ValueError):
+                def_mod = None
+            if def_mod != 'typing_extensions':
+                self.__module__ = def_mod
+
+# 3.7-3.9
+else:
+
+    # Inherits from list as a workaround for Callable checks in Python < 3.9.2.
+    class ParamSpec(list, _DefaultMixin):
+        """Parameter specification variable.
+
+        Usage::
+
+           P = ParamSpec('P')
+
+        Parameter specification variables exist primarily for the benefit of static
+        type checkers.  They are used to forward the parameter types of one
+        callable to another callable, a pattern commonly found in higher order
+        functions and decorators.  They are only valid when used in ``Concatenate``,
+        or s the first argument to ``Callable``. In Python 3.10 and higher,
+        they are also supported in user-defined Generics at runtime.
+        See class Generic for more information on generic types.  An
+        example for annotating a decorator::
+
+           T = TypeVar('T')
+           P = ParamSpec('P')
+
+           def add_logging(f: Callable[P, T]) -> Callable[P, T]:
+               '''A type-safe decorator to add logging to a function.'''
+               def inner(*args: P.args, **kwargs: P.kwargs) -> T:
+                   logging.info(f'{f.__name__} was called')
+                   return f(*args, **kwargs)
+               return inner
+
+           @add_logging
+           def add_two(x: float, y: float) -> float:
+               '''Add two numbers together.'''
+               return x + y
+
+        Parameter specification variables defined with covariant=True or
+        contravariant=True can be used to declare covariant or contravariant
+        generic types.  These keyword arguments are valid, but their actual semantics
+        are yet to be decided.  See PEP 612 for details.
+
+        Parameter specification variables can be introspected. e.g.:
+
+           P.__name__ == 'T'
+           P.__bound__ == None
+           P.__covariant__ == False
+           P.__contravariant__ == False
+
+        Note that only parameter specification variables defined in global scope can
+        be pickled.
+        """
+
+        # Trick Generic __parameters__.
+        __class__ = typing.TypeVar
+
+        @property
+        def args(self):
+            return ParamSpecArgs(self)
+
+        @property
+        def kwargs(self):
+            return ParamSpecKwargs(self)
+
+        def __init__(self, name, *, bound=None, covariant=False, contravariant=False,
+                     default=_marker):
+            super().__init__([self])
+            self.__name__ = name
+            self.__covariant__ = bool(covariant)
+            self.__contravariant__ = bool(contravariant)
+            if bound:
+                self.__bound__ = typing._type_check(bound, 'Bound must be a type.')
+            else:
+                self.__bound__ = None
+            _DefaultMixin.__init__(self, default)
+
+            # for pickling:
+            try:
+                def_mod = sys._getframe(1).f_globals.get('__name__', '__main__')
+            except (AttributeError, ValueError):
+                def_mod = None
+            if def_mod != 'typing_extensions':
+                self.__module__ = def_mod
+
+        def __repr__(self):
+            if self.__covariant__:
+                prefix = '+'
+            elif self.__contravariant__:
+                prefix = '-'
+            else:
+                prefix = '~'
+            return prefix + self.__name__
+
+        def __hash__(self):
+            return object.__hash__(self)
+
+        def __eq__(self, other):
+            return self is other
+
+        def __reduce__(self):
+            return self.__name__
+
+        # Hack to get typing._type_check to pass.
+        def __call__(self, *args, **kwargs):
+            pass
+
+
+# 3.7-3.9
+if not hasattr(typing, 'Concatenate'):
+    # Inherits from list as a workaround for Callable checks in Python < 3.9.2.
+    class _ConcatenateGenericAlias(list):
+
+        # Trick Generic into looking into this for __parameters__.
+        __class__ = typing._GenericAlias
+
+        # Flag in 3.8.
+        _special = False
+
+        def __init__(self, origin, args):
+            super().__init__(args)
+            self.__origin__ = origin
+            self.__args__ = args
+
+        def __repr__(self):
+            _type_repr = typing._type_repr
+            return (f'{_type_repr(self.__origin__)}'
+                    f'[{", ".join(_type_repr(arg) for arg in self.__args__)}]')
+
+        def __hash__(self):
+            return hash((self.__origin__, self.__args__))
+
+        # Hack to get typing._type_check to pass in Generic.
+        def __call__(self, *args, **kwargs):
+            pass
+
+        @property
+        def __parameters__(self):
+            return tuple(
+                tp for tp in self.__args__ if isinstance(tp, (typing.TypeVar, ParamSpec))
+            )
+
+
+# 3.7-3.9
+@typing._tp_cache
+def _concatenate_getitem(self, parameters):
+    if parameters == ():
+        raise TypeError("Cannot take a Concatenate of no types.")
+    if not isinstance(parameters, tuple):
+        parameters = (parameters,)
+    if not isinstance(parameters[-1], ParamSpec):
+        raise TypeError("The last parameter to Concatenate should be a "
+                        "ParamSpec variable.")
+    msg = "Concatenate[arg, ...]: each arg must be a type."
+    parameters = tuple(typing._type_check(p, msg) for p in parameters)
+    return _ConcatenateGenericAlias(self, parameters)
+
+
+# 3.10+
+if hasattr(typing, 'Concatenate'):
+    Concatenate = typing.Concatenate
+    _ConcatenateGenericAlias = typing._ConcatenateGenericAlias # noqa
+# 3.9
+elif sys.version_info[:2] >= (3, 9):
+    @_TypeAliasForm
+    def Concatenate(self, parameters):
+        """Used in conjunction with ``ParamSpec`` and ``Callable`` to represent a
+        higher order function which adds, removes or transforms parameters of a
+        callable.
+
+        For example::
+
+           Callable[Concatenate[int, P], int]
+
+        See PEP 612 for detailed information.
+        """
+        return _concatenate_getitem(self, parameters)
+# 3.7-8
+else:
+    class _ConcatenateForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+        def __getitem__(self, parameters):
+            return _concatenate_getitem(self, parameters)
+
+    Concatenate = _ConcatenateForm(
+        'Concatenate',
+        doc="""Used in conjunction with ``ParamSpec`` and ``Callable`` to represent a
+        higher order function which adds, removes or transforms parameters of a
+        callable.
+
+        For example::
+
+           Callable[Concatenate[int, P], int]
+
+        See PEP 612 for detailed information.
+        """)
+
+# 3.10+
+if hasattr(typing, 'TypeGuard'):
+    TypeGuard = typing.TypeGuard
+# 3.9
+elif sys.version_info[:2] >= (3, 9):
+    class _TypeGuardForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+    @_TypeGuardForm
+    def TypeGuard(self, parameters):
+        """Special typing form used to annotate the return type of a user-defined
+        type guard function.  ``TypeGuard`` only accepts a single type argument.
+        At runtime, functions marked this way should return a boolean.
+
+        ``TypeGuard`` aims to benefit *type narrowing* -- a technique used by static
+        type checkers to determine a more precise type of an expression within a
+        program's code flow.  Usually type narrowing is done by analyzing
+        conditional code flow and applying the narrowing to a block of code.  The
+        conditional expression here is sometimes referred to as a "type guard".
+
+        Sometimes it would be convenient to use a user-defined boolean function
+        as a type guard.  Such a function should use ``TypeGuard[...]`` as its
+        return type to alert static type checkers to this intention.
+
+        Using  ``-> TypeGuard`` tells the static type checker that for a given
+        function:
+
+        1. The return value is a boolean.
+        2. If the return value is ``True``, the type of its argument
+        is the type inside ``TypeGuard``.
+
+        For example::
+
+            def is_str(val: Union[str, float]):
+                # "isinstance" type guard
+                if isinstance(val, str):
+                    # Type of ``val`` is narrowed to ``str``
+                    ...
+                else:
+                    # Else, type of ``val`` is narrowed to ``float``.
+                    ...
+
+        Strict type narrowing is not enforced -- ``TypeB`` need not be a narrower
+        form of ``TypeA`` (it can even be a wider form) and this may lead to
+        type-unsafe results.  The main reason is to allow for things like
+        narrowing ``List[object]`` to ``List[str]`` even though the latter is not
+        a subtype of the former, since ``List`` is invariant.  The responsibility of
+        writing type-safe type guards is left to the user.
+
+        ``TypeGuard`` also works with type variables.  For more information, see
+        PEP 647 (User-Defined Type Guards).
+        """
+        item = typing._type_check(parameters, f'{self} accepts only a single type.')
+        return typing._GenericAlias(self, (item,))
+# 3.7-3.8
+else:
+    class _TypeGuardForm(typing._SpecialForm, _root=True):
+
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+        def __getitem__(self, parameters):
+            item = typing._type_check(parameters,
+                                      f'{self._name} accepts only a single type')
+            return typing._GenericAlias(self, (item,))
+
+    TypeGuard = _TypeGuardForm(
+        'TypeGuard',
+        doc="""Special typing form used to annotate the return type of a user-defined
+        type guard function.  ``TypeGuard`` only accepts a single type argument.
+        At runtime, functions marked this way should return a boolean.
+
+        ``TypeGuard`` aims to benefit *type narrowing* -- a technique used by static
+        type checkers to determine a more precise type of an expression within a
+        program's code flow.  Usually type narrowing is done by analyzing
+        conditional code flow and applying the narrowing to a block of code.  The
+        conditional expression here is sometimes referred to as a "type guard".
+
+        Sometimes it would be convenient to use a user-defined boolean function
+        as a type guard.  Such a function should use ``TypeGuard[...]`` as its
+        return type to alert static type checkers to this intention.
+
+        Using  ``-> TypeGuard`` tells the static type checker that for a given
+        function:
+
+        1. The return value is a boolean.
+        2. If the return value is ``True``, the type of its argument
+        is the type inside ``TypeGuard``.
+
+        For example::
+
+            def is_str(val: Union[str, float]):
+                # "isinstance" type guard
+                if isinstance(val, str):
+                    # Type of ``val`` is narrowed to ``str``
+                    ...
+                else:
+                    # Else, type of ``val`` is narrowed to ``float``.
+                    ...
+
+        Strict type narrowing is not enforced -- ``TypeB`` need not be a narrower
+        form of ``TypeA`` (it can even be a wider form) and this may lead to
+        type-unsafe results.  The main reason is to allow for things like
+        narrowing ``List[object]`` to ``List[str]`` even though the latter is not
+        a subtype of the former, since ``List`` is invariant.  The responsibility of
+        writing type-safe type guards is left to the user.
+
+        ``TypeGuard`` also works with type variables.  For more information, see
+        PEP 647 (User-Defined Type Guards).
+        """)
+
+
+# Vendored from cpython typing._SpecialFrom
+class _SpecialForm(typing._Final, _root=True):
+    __slots__ = ('_name', '__doc__', '_getitem')
+
+    def __init__(self, getitem):
+        self._getitem = getitem
+        self._name = getitem.__name__
+        self.__doc__ = getitem.__doc__
+
+    def __getattr__(self, item):
+        if item in {'__name__', '__qualname__'}:
+            return self._name
+
+        raise AttributeError(item)
+
+    def __mro_entries__(self, bases):
+        raise TypeError(f"Cannot subclass {self!r}")
+
+    def __repr__(self):
+        return f'typing_extensions.{self._name}'
+
+    def __reduce__(self):
+        return self._name
+
+    def __call__(self, *args, **kwds):
+        raise TypeError(f"Cannot instantiate {self!r}")
+
+    def __or__(self, other):
+        return typing.Union[self, other]
+
+    def __ror__(self, other):
+        return typing.Union[other, self]
+
+    def __instancecheck__(self, obj):
+        raise TypeError(f"{self} cannot be used with isinstance()")
+
+    def __subclasscheck__(self, cls):
+        raise TypeError(f"{self} cannot be used with issubclass()")
+
+    @typing._tp_cache
+    def __getitem__(self, parameters):
+        return self._getitem(self, parameters)
+
+
+if hasattr(typing, "LiteralString"):
+    LiteralString = typing.LiteralString
+else:
+    @_SpecialForm
+    def LiteralString(self, params):
+        """Represents an arbitrary literal string.
+
+        Example::
+
+          from typing_extensions import LiteralString
+
+          def query(sql: LiteralString) -> ...:
+              ...
+
+          query("SELECT * FROM table")  # ok
+          query(f"SELECT * FROM {input()}")  # not ok
+
+        See PEP 675 for details.
+
+        """
+        raise TypeError(f"{self} is not subscriptable")
+
+
+if hasattr(typing, "Self"):
+    Self = typing.Self
+else:
+    @_SpecialForm
+    def Self(self, params):
+        """Used to spell the type of "self" in classes.
+
+        Example::
+
+          from typing import Self
+
+          class ReturnsSelf:
+              def parse(self, data: bytes) -> Self:
+                  ...
+                  return self
+
+        """
+
+        raise TypeError(f"{self} is not subscriptable")
+
+
+if hasattr(typing, "Never"):
+    Never = typing.Never
+else:
+    @_SpecialForm
+    def Never(self, params):
+        """The bottom type, a type that has no members.
+
+        This can be used to define a function that should never be
+        called, or a function that never returns::
+
+            from typing_extensions import Never
+
+            def never_call_me(arg: Never) -> None:
+                pass
+
+            def int_or_str(arg: int | str) -> None:
+                never_call_me(arg)  # type checker error
+                match arg:
+                    case int():
+                        print("It's an int")
+                    case str():
+                        print("It's a str")
+                    case _:
+                        never_call_me(arg)  # ok, arg is of type Never
+
+        """
+
+        raise TypeError(f"{self} is not subscriptable")
+
+
+if hasattr(typing, 'Required'):
+    Required = typing.Required
+    NotRequired = typing.NotRequired
+elif sys.version_info[:2] >= (3, 9):
+    class _ExtensionsSpecialForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+    @_ExtensionsSpecialForm
+    def Required(self, parameters):
+        """A special typing construct to mark a key of a total=False TypedDict
+        as required. For example:
+
+            class Movie(TypedDict, total=False):
+                title: Required[str]
+                year: int
+
+            m = Movie(
+                title='The Matrix',  # typechecker error if key is omitted
+                year=1999,
+            )
+
+        There is no runtime checking that a required key is actually provided
+        when instantiating a related TypedDict.
+        """
+        item = typing._type_check(parameters, f'{self._name} accepts only a single type.')
+        return typing._GenericAlias(self, (item,))
+
+    @_ExtensionsSpecialForm
+    def NotRequired(self, parameters):
+        """A special typing construct to mark a key of a TypedDict as
+        potentially missing. For example:
+
+            class Movie(TypedDict):
+                title: str
+                year: NotRequired[int]
+
+            m = Movie(
+                title='The Matrix',  # typechecker error if key is omitted
+                year=1999,
+            )
+        """
+        item = typing._type_check(parameters, f'{self._name} accepts only a single type.')
+        return typing._GenericAlias(self, (item,))
+
+else:
+    class _RequiredForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+        def __getitem__(self, parameters):
+            item = typing._type_check(parameters,
+                                      f'{self._name} accepts only a single type.')
+            return typing._GenericAlias(self, (item,))
+
+    Required = _RequiredForm(
+        'Required',
+        doc="""A special typing construct to mark a key of a total=False TypedDict
+        as required. For example:
+
+            class Movie(TypedDict, total=False):
+                title: Required[str]
+                year: int
+
+            m = Movie(
+                title='The Matrix',  # typechecker error if key is omitted
+                year=1999,
+            )
+
+        There is no runtime checking that a required key is actually provided
+        when instantiating a related TypedDict.
+        """)
+    NotRequired = _RequiredForm(
+        'NotRequired',
+        doc="""A special typing construct to mark a key of a TypedDict as
+        potentially missing. For example:
+
+            class Movie(TypedDict):
+                title: str
+                year: NotRequired[int]
+
+            m = Movie(
+                title='The Matrix',  # typechecker error if key is omitted
+                year=1999,
+            )
+        """)
+
+
+if hasattr(typing, "Unpack"):  # 3.11+
+    Unpack = typing.Unpack
+elif sys.version_info[:2] >= (3, 9):
+    class _UnpackSpecialForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+    class _UnpackAlias(typing._GenericAlias, _root=True):
+        __class__ = typing.TypeVar
+
+    @_UnpackSpecialForm
+    def Unpack(self, parameters):
+        """A special typing construct to unpack a variadic type. For example:
+
+            Shape = TypeVarTuple('Shape')
+            Batch = NewType('Batch', int)
+
+            def add_batch_axis(
+                x: Array[Unpack[Shape]]
+            ) -> Array[Batch, Unpack[Shape]]: ...
+
+        """
+        item = typing._type_check(parameters, f'{self._name} accepts only a single type.')
+        return _UnpackAlias(self, (item,))
+
+    def _is_unpack(obj):
+        return isinstance(obj, _UnpackAlias)
+
+else:
+    class _UnpackAlias(typing._GenericAlias, _root=True):
+        __class__ = typing.TypeVar
+
+    class _UnpackForm(typing._SpecialForm, _root=True):
+        def __repr__(self):
+            return 'typing_extensions.' + self._name
+
+        def __getitem__(self, parameters):
+            item = typing._type_check(parameters,
+                                      f'{self._name} accepts only a single type.')
+            return _UnpackAlias(self, (item,))
+
+    Unpack = _UnpackForm(
+        'Unpack',
+        doc="""A special typing construct to unpack a variadic type. For example:
+
+            Shape = TypeVarTuple('Shape')
+            Batch = NewType('Batch', int)
+
+            def add_batch_axis(
+                x: Array[Unpack[Shape]]
+            ) -> Array[Batch, Unpack[Shape]]: ...
+
+        """)
+
+    def _is_unpack(obj):
+        return isinstance(obj, _UnpackAlias)
+
+
+if hasattr(typing, "TypeVarTuple"):  # 3.11+
+
+    # Add default Parameter - PEP 696
+    class TypeVarTuple(typing.TypeVarTuple, _DefaultMixin, _root=True):
+        """Type variable tuple."""
+
+        def __init__(self, name, *, default=_marker):
+            super().__init__(name)
+            _DefaultMixin.__init__(self, default)
+
+            # for pickling:
+            try:
+                def_mod = sys._getframe(1).f_globals.get('__name__', '__main__')
+            except (AttributeError, ValueError):
+                def_mod = None
+            if def_mod != 'typing_extensions':
+                self.__module__ = def_mod
+
+else:
+    class TypeVarTuple(_DefaultMixin):
+        """Type variable tuple.
+
+        Usage::
+
+            Ts = TypeVarTuple('Ts')
+
+        In the same way that a normal type variable is a stand-in for a single
+        type such as ``int``, a type variable *tuple* is a stand-in for a *tuple*
+        type such as ``Tuple[int, str]``.
+
+        Type variable tuples can be used in ``Generic`` declarations.
+        Consider the following example::
+
+            class Array(Generic[*Ts]): ...
+
+        The ``Ts`` type variable tuple here behaves like ``tuple[T1, T2]``,
+        where ``T1`` and ``T2`` are type variables. To use these type variables
+        as type parameters of ``Array``, we must *unpack* the type variable tuple using
+        the star operator: ``*Ts``. The signature of ``Array`` then behaves
+        as if we had simply written ``class Array(Generic[T1, T2]): ...``.
+        In contrast to ``Generic[T1, T2]``, however, ``Generic[*Shape]`` allows
+        us to parameterise the class with an *arbitrary* number of type parameters.
+
+        Type variable tuples can be used anywhere a normal ``TypeVar`` can.
+        This includes class definitions, as shown above, as well as function
+        signatures and variable annotations::
+
+            class Array(Generic[*Ts]):
+
+                def __init__(self, shape: Tuple[*Ts]):
+                    self._shape: Tuple[*Ts] = shape
+
+                def get_shape(self) -> Tuple[*Ts]:
+                    return self._shape
+
+            shape = (Height(480), Width(640))
+            x: Array[Height, Width] = Array(shape)
+            y = abs(x)  # Inferred type is Array[Height, Width]
+            z = x + x   #        ...    is Array[Height, Width]
+            x.get_shape()  #     ...    is tuple[Height, Width]
+
+        """
+
+        # Trick Generic __parameters__.
+        __class__ = typing.TypeVar
+
+        def __iter__(self):
+            yield self.__unpacked__
+
+        def __init__(self, name, *, default=_marker):
+            self.__name__ = name
+            _DefaultMixin.__init__(self, default)
+
+            # for pickling:
+            try:
+                def_mod = sys._getframe(1).f_globals.get('__name__', '__main__')
+            except (AttributeError, ValueError):
+                def_mod = None
+            if def_mod != 'typing_extensions':
+                self.__module__ = def_mod
+
+            self.__unpacked__ = Unpack[self]
+
+        def __repr__(self):
+            return self.__name__
+
+        def __hash__(self):
+            return object.__hash__(self)
+
+        def __eq__(self, other):
+            return self is other
+
+        def __reduce__(self):
+            return self.__name__
+
+        def __init_subclass__(self, *args, **kwds):
+            if '_root' not in kwds:
+                raise TypeError("Cannot subclass special typing classes")
+
+
+if hasattr(typing, "reveal_type"):
+    reveal_type = typing.reveal_type
+else:
+    def reveal_type(__obj: T) -> T:
+        """Reveal the inferred type of a variable.
+
+        When a static type checker encounters a call to ``reveal_type()``,
+        it will emit the inferred type of the argument::
+
+            x: int = 1
+            reveal_type(x)
+
+        Running a static type checker (e.g., ``mypy``) on this example
+        will produce output similar to 'Revealed type is "builtins.int"'.
+
+        At runtime, the function prints the runtime type of the
+        argument and returns it unchanged.
+
+        """
+        print(f"Runtime type is {type(__obj).__name__!r}", file=sys.stderr)
+        return __obj
+
+
+if hasattr(typing, "assert_never"):
+    assert_never = typing.assert_never
+else:
+    def assert_never(__arg: Never) -> Never:
+        """Assert to the type checker that a line of code is unreachable.
+
+        Example::
+
+            def int_or_str(arg: int | str) -> None:
+                match arg:
+                    case int():
+                        print("It's an int")
+                    case str():
+                        print("It's a str")
+                    case _:
+                        assert_never(arg)
+
+        If a type checker finds that a call to assert_never() is
+        reachable, it will emit an error.
+
+        At runtime, this throws an exception when called.
+
+        """
+        raise AssertionError("Expected code to be unreachable")
+
+
+if sys.version_info >= (3, 12):
+    # dataclass_transform exists in 3.11 but lacks the frozen_default parameter
+    dataclass_transform = typing.dataclass_transform
+else:
+    def dataclass_transform(
+        *,
+        eq_default: bool = True,
+        order_default: bool = False,
+        kw_only_default: bool = False,
+        frozen_default: bool = False,
+        field_specifiers: typing.Tuple[
+            typing.Union[typing.Type[typing.Any], typing.Callable[..., typing.Any]],
+            ...
+        ] = (),
+        **kwargs: typing.Any,
+    ) -> typing.Callable[[T], T]:
+        """Decorator that marks a function, class, or metaclass as providing
+        dataclass-like behavior.
+
+        Example:
+
+            from typing_extensions import dataclass_transform
+
+            _T = TypeVar("_T")
+
+            # Used on a decorator function
+            @dataclass_transform()
+            def create_model(cls: type[_T]) -> type[_T]:
+                ...
+                return cls
+
+            @create_model
+            class CustomerModel:
+                id: int
+                name: str
+
+            # Used on a base class
+            @dataclass_transform()
+            class ModelBase: ...
+
+            class CustomerModel(ModelBase):
+                id: int
+                name: str
+
+            # Used on a metaclass
+            @dataclass_transform()
+            class ModelMeta(type): ...
+
+            class ModelBase(metaclass=ModelMeta): ...
+
+            class CustomerModel(ModelBase):
+                id: int
+                name: str
+
+        Each of the ``CustomerModel`` classes defined in this example will now
+        behave similarly to a dataclass created with the ``@dataclasses.dataclass``
+        decorator. For example, the type checker will synthesize an ``__init__``
+        method.
+
+        The arguments to this decorator can be used to customize this behavior:
+        - ``eq_default`` indicates whether the ``eq`` parameter is assumed to be
+          True or False if it is omitted by the caller.
+        - ``order_default`` indicates whether the ``order`` parameter is
+          assumed to be True or False if it is omitted by the caller.
+        - ``kw_only_default`` indicates whether the ``kw_only`` parameter is
+          assumed to be True or False if it is omitted by the caller.
+        - ``frozen_default`` indicates whether the ``frozen`` parameter is
+          assumed to be True or False if it is omitted by the caller.
+        - ``field_specifiers`` specifies a static list of supported classes
+          or functions that describe fields, similar to ``dataclasses.field()``.
+
+        At runtime, this decorator records its arguments in the
+        ``__dataclass_transform__`` attribute on the decorated object.
+
+        See PEP 681 for details.
+
+        """
+        def decorator(cls_or_fn):
+            cls_or_fn.__dataclass_transform__ = {
+                "eq_default": eq_default,
+                "order_default": order_default,
+                "kw_only_default": kw_only_default,
+                "frozen_default": frozen_default,
+                "field_specifiers": field_specifiers,
+                "kwargs": kwargs,
+            }
+            return cls_or_fn
+        return decorator
+
+
+if hasattr(typing, "override"):
+    override = typing.override
+else:
+    _F = typing.TypeVar("_F", bound=typing.Callable[..., typing.Any])
+
+    def override(__arg: _F) -> _F:
+        """Indicate that a method is intended to override a method in a base class.
+
+        Usage:
+
+            class Base:
+                def method(self) -> None: ...
+                    pass
+
+            class Child(Base):
+                @override
+                def method(self) -> None:
+                    super().method()
+
+        When this decorator is applied to a method, the type checker will
+        validate that it overrides a method with the same name on a base class.
+        This helps prevent bugs that may occur when a base class is changed
+        without an equivalent change to a child class.
+
+        There is no runtime checking of these properties. The decorator
+        sets the ``__override__`` attribute to ``True`` on the decorated object
+        to allow runtime introspection.
+
+        See PEP 698 for details.
+
+        """
+        try:
+            __arg.__override__ = True
+        except (AttributeError, TypeError):
+            # Skip the attribute silently if it is not writable.
+            # AttributeError happens if the object has __slots__ or a
+            # read-only property, TypeError if it's a builtin class.
+            pass
+        return __arg
+
+
+if hasattr(typing, "deprecated"):
+    deprecated = typing.deprecated
+else:
+    _T = typing.TypeVar("_T")
+
+    def deprecated(
+        __msg: str,
+        *,
+        category: typing.Optional[typing.Type[Warning]] = DeprecationWarning,
+        stacklevel: int = 1,
+    ) -> typing.Callable[[_T], _T]:
+        """Indicate that a class, function or overload is deprecated.
+
+        Usage:
+
+            @deprecated("Use B instead")
+            class A:
+                pass
+
+            @deprecated("Use g instead")
+            def f():
+                pass
+
+            @overload
+            @deprecated("int support is deprecated")
+            def g(x: int) -> int: ...
+            @overload
+            def g(x: str) -> int: ...
+
+        When this decorator is applied to an object, the type checker
+        will generate a diagnostic on usage of the deprecated object.
+
+        No runtime warning is issued. The decorator sets the ``__deprecated__``
+        attribute on the decorated object to the deprecation message
+        passed to the decorator. If applied to an overload, the decorator
+        must be after the ``@overload`` decorator for the attribute to
+        exist on the overload as returned by ``get_overloads()``.
+
+        See PEP 702 for details.
+
+        """
+        def decorator(__arg: _T) -> _T:
+            if category is None:
+                __arg.__deprecated__ = __msg
+                return __arg
+            elif isinstance(__arg, type):
+                original_new = __arg.__new__
+                has_init = __arg.__init__ is not object.__init__
+
+                @functools.wraps(original_new)
+                def __new__(cls, *args, **kwargs):
+                    warnings.warn(__msg, category=category, stacklevel=stacklevel + 1)
+                    # Mirrors a similar check in object.__new__.
+                    if not has_init and (args or kwargs):
+                        raise TypeError(f"{cls.__name__}() takes no arguments")
+                    if original_new is not object.__new__:
+                        return original_new(cls, *args, **kwargs)
+                    else:
+                        return original_new(cls)
+
+                __arg.__new__ = staticmethod(__new__)
+                __arg.__deprecated__ = __new__.__deprecated__ = __msg
+                return __arg
+            elif callable(__arg):
+                @functools.wraps(__arg)
+                def wrapper(*args, **kwargs):
+                    warnings.warn(__msg, category=category, stacklevel=stacklevel + 1)
+                    return __arg(*args, **kwargs)
+
+                __arg.__deprecated__ = wrapper.__deprecated__ = __msg
+                return wrapper
+            else:
+                raise TypeError(
+                    "@deprecated decorator with non-None category must be applied to "
+                    f"a class or callable, not {__arg!r}"
+                )
+
+        return decorator
+
+
+# We have to do some monkey patching to deal with the dual nature of
+# Unpack/TypeVarTuple:
+# - We want Unpack to be a kind of TypeVar so it gets accepted in
+#   Generic[Unpack[Ts]]
+# - We want it to *not* be treated as a TypeVar for the purposes of
+#   counting generic parameters, so that when we subscript a generic,
+#   the runtime doesn't try to substitute the Unpack with the subscripted type.
+if not hasattr(typing, "TypeVarTuple"):
+    typing._collect_type_vars = _collect_type_vars
+    typing._check_generic = _check_generic
+
+
+# Backport typing.NamedTuple as it exists in Python 3.11.
+# In 3.11, the ability to define generic `NamedTuple`s was supported.
+# This was explicitly disallowed in 3.9-3.10, and only half-worked in <=3.8.
+if sys.version_info >= (3, 11):
+    NamedTuple = typing.NamedTuple
+else:
+    def _caller():
+        try:
+            return sys._getframe(2).f_globals.get('__name__', '__main__')
+        except (AttributeError, ValueError):  # For platforms without _getframe()
+            return None
+
+    def _make_nmtuple(name, types, module, defaults=()):
+        fields = [n for n, t in types]
+        annotations = {n: typing._type_check(t, f"field {n} annotation must be a type")
+                       for n, t in types}
+        nm_tpl = collections.namedtuple(name, fields,
+                                        defaults=defaults, module=module)
+        nm_tpl.__annotations__ = nm_tpl.__new__.__annotations__ = annotations
+        # The `_field_types` attribute was removed in 3.9;
+        # in earlier versions, it is the same as the `__annotations__` attribute
+        if sys.version_info < (3, 9):
+            nm_tpl._field_types = annotations
+        return nm_tpl
+
+    _prohibited_namedtuple_fields = typing._prohibited
+    _special_namedtuple_fields = frozenset({'__module__', '__name__', '__annotations__'})
+
+    class _NamedTupleMeta(type):
+        def __new__(cls, typename, bases, ns):
+            assert _NamedTuple in bases
+            for base in bases:
+                if base is not _NamedTuple and base is not typing.Generic:
+                    raise TypeError(
+                        'can only inherit from a NamedTuple type and Generic')
+            bases = tuple(tuple if base is _NamedTuple else base for base in bases)
+            types = ns.get('__annotations__', {})
+            default_names = []
+            for field_name in types:
+                if field_name in ns:
+                    default_names.append(field_name)
+                elif default_names:
+                    raise TypeError(f"Non-default namedtuple field {field_name} "
+                                    f"cannot follow default field"
+                                    f"{'s' if len(default_names) > 1 else ''} "
+                                    f"{', '.join(default_names)}")
+            nm_tpl = _make_nmtuple(
+                typename, types.items(),
+                defaults=[ns[n] for n in default_names],
+                module=ns['__module__']
+            )
+            nm_tpl.__bases__ = bases
+            if typing.Generic in bases:
+                class_getitem = typing.Generic.__class_getitem__.__func__
+                nm_tpl.__class_getitem__ = classmethod(class_getitem)
+            # update from user namespace without overriding special namedtuple attributes
+            for key in ns:
+                if key in _prohibited_namedtuple_fields:
+                    raise AttributeError("Cannot overwrite NamedTuple attribute " + key)
+                elif key not in _special_namedtuple_fields and key not in nm_tpl._fields:
+                    setattr(nm_tpl, key, ns[key])
+            if typing.Generic in bases:
+                nm_tpl.__init_subclass__()
+            return nm_tpl
+
+    def NamedTuple(__typename, __fields=None, **kwargs):
+        if __fields is None:
+            __fields = kwargs.items()
+        elif kwargs:
+            raise TypeError("Either list of fields or keywords"
+                            " can be provided to NamedTuple, not both")
+        return _make_nmtuple(__typename, __fields, module=_caller())
+
+    NamedTuple.__doc__ = typing.NamedTuple.__doc__
+    _NamedTuple = type.__new__(_NamedTupleMeta, 'NamedTuple', (), {})
+
+    # On 3.8+, alter the signature so that it matches typing.NamedTuple.
+    # The signature of typing.NamedTuple on >=3.8 is invalid syntax in Python 3.7,
+    # so just leave the signature as it is on 3.7.
+    if sys.version_info >= (3, 8):
+        NamedTuple.__text_signature__ = '(typename, fields=None, /, **kwargs)'
+
+    def _namedtuple_mro_entries(bases):
+        assert NamedTuple in bases
+        return (_NamedTuple,)
+
+    NamedTuple.__mro_entries__ = _namedtuple_mro_entries
diff --git a/yarl/__init__.py b/yarl/__init__.py
new file mode 100644
index 0000000..b92ac79
--- /dev/null
+++ b/yarl/__init__.py
@@ -0,0 +1,5 @@
+from ._url import URL, cache_clear, cache_configure, cache_info
+
+__version__ = "1.9.2"
+
+__all__ = ("URL", "cache_clear", "cache_configure", "cache_info")
diff --git a/yarl/__init__.pyi b/yarl/__init__.pyi
new file mode 100644
index 0000000..dac481d
--- /dev/null
+++ b/yarl/__init__.pyi
@@ -0,0 +1,119 @@
+import sys
+from functools import _CacheInfo
+from typing import Any, Mapping, Optional, Sequence, Tuple, Type, Union, overload
+
+import multidict
+
+if sys.version_info >= (3, 8):
+    from typing import Final, TypedDict, final
+else:
+    from typing_extensions import Final, TypedDict, final
+
+_SimpleQuery = Union[str, int, float]
+_QueryVariable = Union[_SimpleQuery, Sequence[_SimpleQuery]]
+_Query = Union[
+    None, str, Mapping[str, _QueryVariable], Sequence[Tuple[str, _QueryVariable]]
+]
+
+@final
+class URL:
+    scheme: Final[str]
+    raw_user: Final[str]
+    user: Final[Optional[str]]
+    raw_password: Final[Optional[str]]
+    password: Final[Optional[str]]
+    raw_host: Final[Optional[str]]
+    host: Final[Optional[str]]
+    port: Final[Optional[int]]
+    raw_authority: Final[str]
+    authority: Final[str]
+    raw_path: Final[str]
+    path: Final[str]
+    raw_query_string: Final[str]
+    query_string: Final[str]
+    path_qs: Final[str]
+    raw_path_qs: Final[str]
+    raw_fragment: Final[str]
+    fragment: Final[str]
+    query: Final[multidict.MultiDict[str]]
+    raw_name: Final[str]
+    name: Final[str]
+    raw_suffix: Final[str]
+    suffix: Final[str]
+    raw_suffixes: Final[Tuple[str, ...]]
+    suffixes: Final[Tuple[str, ...]]
+    raw_parts: Final[Tuple[str, ...]]
+    parts: Final[Tuple[str, ...]]
+    parent: Final[URL]
+    def __init__(
+        self, val: Union[str, "URL"] = ..., *, encoded: bool = ...
+    ) -> None: ...
+    @classmethod
+    def build(
+        cls,
+        *,
+        scheme: str = ...,
+        authority: str = ...,
+        user: Optional[str] = ...,
+        password: Optional[str] = ...,
+        host: str = ...,
+        port: Optional[int] = ...,
+        path: str = ...,
+        query: Optional[_Query] = ...,
+        query_string: str = ...,
+        fragment: str = ...,
+        encoded: bool = ...
+    ) -> URL: ...
+    def __str__(self) -> str: ...
+    def __repr__(self) -> str: ...
+    def __eq__(self, other: Any) -> bool: ...
+    def __le__(self, other: Any) -> bool: ...
+    def __lt__(self, other: Any) -> bool: ...
+    def __ge__(self, other: Any) -> bool: ...
+    def __gt__(self, other: Any) -> bool: ...
+    def __hash__(self) -> int: ...
+    def __truediv__(self, name: str) -> URL: ...
+    def __mod__(self, query: _Query) -> URL: ...
+    def is_absolute(self) -> bool: ...
+    def is_default_port(self) -> bool: ...
+    def origin(self) -> URL: ...
+    def relative(self) -> URL: ...
+    def with_scheme(self, scheme: str) -> URL: ...
+    def with_user(self, user: Optional[str]) -> URL: ...
+    def with_password(self, password: Optional[str]) -> URL: ...
+    def with_host(self, host: str) -> URL: ...
+    def with_port(self, port: Optional[int]) -> URL: ...
+    def with_path(self, path: str, *, encoded: bool = ...) -> URL: ...
+    @overload
+    def with_query(self, query: _Query) -> URL: ...
+    @overload
+    def with_query(self, **kwargs: _QueryVariable) -> URL: ...
+    @overload
+    def update_query(self, query: _Query) -> URL: ...
+    @overload
+    def update_query(self, **kwargs: _QueryVariable) -> URL: ...
+    def with_fragment(self, fragment: Optional[str]) -> URL: ...
+    def with_name(self, name: str) -> URL: ...
+    def with_suffix(self, suffix: str) -> URL: ...
+    def join(self, url: URL) -> URL: ...
+    def joinpath(self, *url: str) -> URL: ...
+    def human_repr(self) -> str: ...
+    # private API
+    @classmethod
+    def _normalize_path(cls, path: str) -> str: ...
+
+@final
+class cached_property:
+    def __init__(self, wrapped: Any) -> None: ...
+    def __get__(self, inst: URL, owner: Type[URL]) -> Any: ...
+    def __set__(self, inst: URL, value: Any) -> None: ...
+
+class CacheInfo(TypedDict):
+    idna_encode: _CacheInfo
+    idna_decode: _CacheInfo
+
+def cache_clear() -> None: ...
+def cache_info() -> CacheInfo: ...
+def cache_configure(
+    *, idna_encode_size: Optional[int] = ..., idna_decode_size: Optional[int] = ...
+) -> None: ...
diff --git a/yarl/_quoting.py b/yarl/_quoting.py
new file mode 100644
index 0000000..8d1c705
--- /dev/null
+++ b/yarl/_quoting.py
@@ -0,0 +1,18 @@
+import os
+import sys
+
+__all__ = ("_Quoter", "_Unquoter")
+
+
+NO_EXTENSIONS = bool(os.environ.get("YARL_NO_EXTENSIONS"))  # type: bool
+if sys.implementation.name != "cpython":
+    NO_EXTENSIONS = True
+
+
+if not NO_EXTENSIONS:  # pragma: no branch
+    try:
+        from ._quoting_c import _Quoter, _Unquoter  # type: ignore[assignment]
+    except ImportError:  # pragma: no cover
+        from ._quoting_py import _Quoter, _Unquoter  # type: ignore[assignment]
+else:
+    from ._quoting_py import _Quoter, _Unquoter  # type: ignore[assignment]
diff --git a/yarl/_quoting_c.pyi b/yarl/_quoting_c.pyi
new file mode 100644
index 0000000..1c8fc24
--- /dev/null
+++ b/yarl/_quoting_c.pyi
@@ -0,0 +1,16 @@
+from typing import Optional
+
+class _Quoter:
+    def __init__(
+        self,
+        *,
+        safe: str = ...,
+        protected: str = ...,
+        qs: bool = ...,
+        requote: bool = ...
+    ) -> None: ...
+    def __call__(self, val: Optional[str] = ...) -> Optional[str]: ...
+
+class _Unquoter:
+    def __init__(self, *, unsafe: str = ..., qs: bool = ...) -> None: ...
+    def __call__(self, val: Optional[str] = ...) -> Optional[str]: ...
diff --git a/yarl/_quoting_c.pyx b/yarl/_quoting_c.pyx
new file mode 100644
index 0000000..5335d17
--- /dev/null
+++ b/yarl/_quoting_c.pyx
@@ -0,0 +1,371 @@
+# cython: language_level=3
+
+from cpython.exc cimport PyErr_NoMemory
+from cpython.mem cimport PyMem_Free, PyMem_Malloc, PyMem_Realloc
+from cpython.unicode cimport PyUnicode_DecodeASCII, PyUnicode_DecodeUTF8Stateful
+from libc.stdint cimport uint8_t, uint64_t
+from libc.string cimport memcpy, memset
+
+from string import ascii_letters, digits
+
+
+cdef str GEN_DELIMS = ":/?#[]@"
+cdef str SUB_DELIMS_WITHOUT_QS = "!$'()*,"
+cdef str SUB_DELIMS = SUB_DELIMS_WITHOUT_QS + '+?=;'
+cdef str RESERVED = GEN_DELIMS + SUB_DELIMS
+cdef str UNRESERVED = ascii_letters + digits + '-._~'
+cdef str ALLOWED = UNRESERVED + SUB_DELIMS_WITHOUT_QS
+cdef str QS = '+&=;'
+
+DEF BUF_SIZE = 8 * 1024  # 8KiB
+cdef char BUFFER[BUF_SIZE]
+
+cdef inline Py_UCS4 _to_hex(uint8_t v):
+    if v < 10:
+        return <Py_UCS4>(v+0x30)  # ord('0') == 0x30
+    else:
+        return <Py_UCS4>(v+0x41-10)  # ord('A') == 0x41
+
+
+cdef inline int _from_hex(Py_UCS4 v):
+    if '0' <= v <= '9':
+        return <int>(v) - 0x30  # ord('0') == 0x30
+    elif 'A' <= v <= 'F':
+        return <int>(v) - 0x41 + 10  # ord('A') == 0x41
+    elif 'a' <= v <= 'f':
+        return <int>(v) - 0x61 + 10  # ord('a') == 0x61
+    else:
+        return -1
+
+
+cdef inline int _is_lower_hex(Py_UCS4 v):
+    return 'a' <= v <= 'f'
+
+
+cdef inline Py_UCS4 _restore_ch(Py_UCS4 d1, Py_UCS4 d2):
+    cdef int digit1 = _from_hex(d1)
+    if digit1 < 0:
+        return <Py_UCS4>-1
+    cdef int digit2 = _from_hex(d2)
+    if digit2 < 0:
+        return <Py_UCS4>-1
+    return <Py_UCS4>(digit1 << 4 | digit2)
+
+
+cdef uint8_t ALLOWED_TABLE[16]
+cdef uint8_t ALLOWED_NOTQS_TABLE[16]
+
+
+cdef inline bint bit_at(uint8_t array[], uint64_t ch):
+    return array[ch >> 3] & (1 << (ch & 7))
+
+
+cdef inline void set_bit(uint8_t array[], uint64_t ch):
+    array[ch >> 3] |= (1 << (ch & 7))
+
+
+memset(ALLOWED_TABLE, 0, sizeof(ALLOWED_TABLE))
+memset(ALLOWED_NOTQS_TABLE, 0, sizeof(ALLOWED_NOTQS_TABLE))
+
+for i in range(128):
+    if chr(i) in ALLOWED:
+        set_bit(ALLOWED_TABLE, i)
+        set_bit(ALLOWED_NOTQS_TABLE, i)
+    if chr(i) in QS:
+        set_bit(ALLOWED_NOTQS_TABLE, i)
+
+# ----------------- writer ---------------------------
+
+cdef struct Writer:
+    char *buf
+    Py_ssize_t size
+    Py_ssize_t pos
+    bint changed
+
+
+cdef inline void _init_writer(Writer* writer):
+    writer.buf = &BUFFER[0]
+    writer.size = BUF_SIZE
+    writer.pos = 0
+    writer.changed = 0
+
+
+cdef inline void _release_writer(Writer* writer):
+    if writer.buf != BUFFER:
+        PyMem_Free(writer.buf)
+
+
+cdef inline int _write_char(Writer* writer, Py_UCS4 ch, bint changed):
+    cdef char * buf
+    cdef Py_ssize_t size
+
+    if writer.pos == writer.size:
+        # reallocate
+        size = writer.size + BUF_SIZE
+        if writer.buf == BUFFER:
+            buf = <char*>PyMem_Malloc(size)
+            if buf == NULL:
+                PyErr_NoMemory()
+                return -1
+            memcpy(buf, writer.buf, writer.size)
+        else:
+            buf = <char*>PyMem_Realloc(writer.buf, size)
+            if buf == NULL:
+                PyErr_NoMemory()
+                return -1
+        writer.buf = buf
+        writer.size = size
+    writer.buf[writer.pos] = <char>ch
+    writer.pos += 1
+    writer.changed |= changed
+    return 0
+
+
+cdef inline int _write_pct(Writer* writer, uint8_t ch, bint changed):
+    if _write_char(writer, '%', changed) < 0:
+        return -1
+    if _write_char(writer, _to_hex(<uint8_t>ch >> 4), changed) < 0:
+        return -1
+    return _write_char(writer, _to_hex(<uint8_t>ch & 0x0f), changed)
+
+
+cdef inline int _write_utf8(Writer* writer, Py_UCS4 symbol):
+    cdef uint64_t utf = <uint64_t> symbol
+
+    if utf < 0x80:
+        return _write_pct(writer, <uint8_t>utf, True)
+    elif utf < 0x800:
+        if _write_pct(writer, <uint8_t>(0xc0 | (utf >> 6)), True) < 0:
+            return -1
+        return _write_pct(writer,  <uint8_t>(0x80 | (utf & 0x3f)), True)
+    elif 0xD800 <= utf <= 0xDFFF:
+        # surogate pair, ignored
+        return 0
+    elif utf < 0x10000:
+        if _write_pct(writer, <uint8_t>(0xe0 | (utf >> 12)), True) < 0:
+            return -1
+        if _write_pct(writer, <uint8_t>(0x80 | ((utf >> 6) & 0x3f)),
+                       True) < 0:
+            return -1
+        return _write_pct(writer, <uint8_t>(0x80 | (utf & 0x3f)), True)
+    elif utf > 0x10FFFF:
+        # symbol is too large
+        return 0
+    else:
+        if _write_pct(writer,  <uint8_t>(0xf0 | (utf >> 18)), True) < 0:
+            return -1
+        if _write_pct(writer,  <uint8_t>(0x80 | ((utf >> 12) & 0x3f)),
+                       True) < 0:
+           return -1
+        if _write_pct(writer,  <uint8_t>(0x80 | ((utf >> 6) & 0x3f)),
+                       True) < 0:
+            return -1
+        return _write_pct(writer, <uint8_t>(0x80 | (utf & 0x3f)), True)
+
+
+# --------------------- end writer --------------------------
+
+
+cdef class _Quoter:
+    cdef bint _qs
+    cdef bint _requote
+
+    cdef uint8_t _safe_table[16]
+    cdef uint8_t _protected_table[16]
+
+    def __init__(
+            self, *, str safe='', str protected='', bint qs=False, bint requote=True,
+    ):
+        cdef Py_UCS4 ch
+
+        self._qs = qs
+        self._requote = requote
+
+        if not self._qs:
+            memcpy(self._safe_table,
+                   ALLOWED_NOTQS_TABLE,
+                   sizeof(self._safe_table))
+        else:
+            memcpy(self._safe_table,
+                   ALLOWED_TABLE,
+                   sizeof(self._safe_table))
+        for ch in safe:
+            if ord(ch) > 127:
+                raise ValueError("Only safe symbols with ORD < 128 are allowed")
+            set_bit(self._safe_table, ch)
+
+        memset(self._protected_table, 0, sizeof(self._protected_table))
+        for ch in protected:
+            if ord(ch) > 127:
+                raise ValueError("Only safe symbols with ORD < 128 are allowed")
+            set_bit(self._safe_table, ch)
+            set_bit(self._protected_table, ch)
+
+    def __call__(self, val):
+        cdef Writer writer
+        if val is None:
+            return None
+        if type(val) is not str:
+            if isinstance(val, str):
+                # derived from str
+                val = str(val)
+            else:
+                raise TypeError("Argument should be str")
+        _init_writer(&writer)
+        try:
+            return self._do_quote(<str>val, &writer)
+        finally:
+            _release_writer(&writer)
+
+    cdef str _do_quote(self, str val, Writer *writer):
+        cdef Py_UCS4 ch
+        cdef int changed
+        cdef int idx = 0
+        cdef int length = len(val)
+
+        while idx < length:
+            ch = val[idx]
+            idx += 1
+            if ch == '%' and self._requote and idx <= length - 2:
+                ch = _restore_ch(val[idx], val[idx + 1])
+                if ch != <Py_UCS4>-1:
+                    idx += 2
+                    if ch < 128:
+                        if bit_at(self._protected_table, ch):
+                            if _write_pct(writer, ch, True) < 0:
+                                raise
+                            continue
+
+                        if bit_at(self._safe_table, ch):
+                            if _write_char(writer, ch, True) < 0:
+                                raise
+                            continue
+
+                    changed = (_is_lower_hex(val[idx - 2]) or
+                               _is_lower_hex(val[idx - 1]))
+                    if _write_pct(writer, ch, changed) < 0:
+                        raise
+                    continue
+                else:
+                    ch = '%'
+
+            if self._write(writer, ch) < 0:
+                raise
+
+        if not writer.changed:
+            return val
+        else:
+            return PyUnicode_DecodeASCII(writer.buf, writer.pos, "strict")
+
+    cdef inline int _write(self, Writer *writer, Py_UCS4 ch):
+        if self._qs:
+            if ch == ' ':
+                return _write_char(writer, '+', True)
+
+        if ch < 128 and bit_at(self._safe_table, ch):
+            return _write_char(writer, ch, False)
+
+        return _write_utf8(writer, ch)
+
+
+cdef class _Unquoter:
+    cdef str _unsafe
+    cdef bint _qs
+    cdef _Quoter _quoter
+    cdef _Quoter _qs_quoter
+
+    def __init__(self, *, unsafe='', qs=False):
+        self._unsafe = unsafe
+        self._qs = qs
+        self._quoter = _Quoter()
+        self._qs_quoter = _Quoter(qs=True)
+
+    def __call__(self, val):
+        if val is None:
+            return None
+        if type(val) is not str:
+            if isinstance(val, str):
+                # derived from str
+                val = str(val)
+            else:
+                raise TypeError("Argument should be str")
+        return self._do_unquote(<str>val)
+
+    cdef str _do_unquote(self, str val):
+        if len(val) == 0:
+            return val
+        cdef list ret = []
+        cdef char buffer[4]
+        cdef Py_ssize_t buflen = 0
+        cdef Py_ssize_t consumed
+        cdef str unquoted
+        cdef Py_UCS4 ch = 0
+        cdef Py_ssize_t idx = 0
+        cdef Py_ssize_t length = len(val)
+        cdef Py_ssize_t start_pct
+
+        while idx < length:
+            ch = val[idx]
+            idx += 1
+            if ch == '%' and idx <= length - 2:
+                ch = _restore_ch(val[idx], val[idx + 1])
+                if ch != <Py_UCS4>-1:
+                    idx += 2
+                    assert buflen < 4
+                    buffer[buflen] = ch
+                    buflen += 1
+                    try:
+                        unquoted = PyUnicode_DecodeUTF8Stateful(buffer, buflen,
+                                                                NULL, &consumed)
+                    except UnicodeDecodeError:
+                        start_pct = idx - buflen * 3
+                        buffer[0] = ch
+                        buflen = 1
+                        ret.append(val[start_pct : idx - 3])
+                        try:
+                            unquoted = PyUnicode_DecodeUTF8Stateful(buffer, buflen,
+                                                                    NULL, &consumed)
+                        except UnicodeDecodeError:
+                            buflen = 0
+                            ret.append(val[idx - 3 : idx])
+                            continue
+                    if not unquoted:
+                        assert consumed == 0
+                        continue
+                    assert consumed == buflen
+                    buflen = 0
+                    if self._qs and unquoted in '+=&;':
+                        ret.append(self._qs_quoter(unquoted))
+                    elif unquoted in self._unsafe:
+                        ret.append(self._quoter(unquoted))
+                    else:
+                        ret.append(unquoted)
+                    continue
+                else:
+                    ch = '%'
+
+            if buflen:
+                start_pct = idx - 1 - buflen * 3
+                ret.append(val[start_pct : idx - 1])
+                buflen = 0
+
+            if ch == '+':
+                if not self._qs or ch in self._unsafe:
+                    ret.append('+')
+                else:
+                    ret.append(' ')
+                continue
+
+            if ch in self._unsafe:
+                ret.append('%')
+                h = hex(ord(ch)).upper()[2:]
+                for ch in h:
+                    ret.append(ch)
+                continue
+
+            ret.append(ch)
+
+        if buflen:
+            ret.append(val[length - buflen * 3 : length])
+
+        return ''.join(ret)
diff --git a/yarl/_quoting_py.py b/yarl/_quoting_py.py
new file mode 100644
index 0000000..585a1da
--- /dev/null
+++ b/yarl/_quoting_py.py
@@ -0,0 +1,197 @@
+import codecs
+import re
+from string import ascii_letters, ascii_lowercase, digits
+from typing import Optional, cast
+
+BASCII_LOWERCASE = ascii_lowercase.encode("ascii")
+BPCT_ALLOWED = {f"%{i:02X}".encode("ascii") for i in range(256)}
+GEN_DELIMS = ":/?#[]@"
+SUB_DELIMS_WITHOUT_QS = "!$'()*,"
+SUB_DELIMS = SUB_DELIMS_WITHOUT_QS + "+&=;"
+RESERVED = GEN_DELIMS + SUB_DELIMS
+UNRESERVED = ascii_letters + digits + "-._~"
+ALLOWED = UNRESERVED + SUB_DELIMS_WITHOUT_QS
+
+
+_IS_HEX = re.compile(b"[A-Z0-9][A-Z0-9]")
+_IS_HEX_STR = re.compile("[A-Fa-f0-9][A-Fa-f0-9]")
+
+utf8_decoder = codecs.getincrementaldecoder("utf-8")
+
+
+class _Quoter:
+    def __init__(
+        self,
+        *,
+        safe: str = "",
+        protected: str = "",
+        qs: bool = False,
+        requote: bool = True,
+    ) -> None:
+        self._safe = safe
+        self._protected = protected
+        self._qs = qs
+        self._requote = requote
+
+    def __call__(self, val: Optional[str]) -> Optional[str]:
+        if val is None:
+            return None
+        if not isinstance(val, str):
+            raise TypeError("Argument should be str")
+        if not val:
+            return ""
+        bval = cast(str, val).encode("utf8", errors="ignore")
+        ret = bytearray()
+        pct = bytearray()
+        safe = self._safe
+        safe += ALLOWED
+        if not self._qs:
+            safe += "+&=;"
+        safe += self._protected
+        bsafe = safe.encode("ascii")
+        idx = 0
+        while idx < len(bval):
+            ch = bval[idx]
+            idx += 1
+
+            if pct:
+                if ch in BASCII_LOWERCASE:
+                    ch = ch - 32  # convert to uppercase
+                pct.append(ch)
+                if len(pct) == 3:  # pragma: no branch   # peephole optimizer
+                    buf = pct[1:]
+                    if not _IS_HEX.match(buf):
+                        ret.extend(b"%25")
+                        pct.clear()
+                        idx -= 2
+                        continue
+                    try:
+                        unquoted = chr(int(pct[1:].decode("ascii"), base=16))
+                    except ValueError:
+                        ret.extend(b"%25")
+                        pct.clear()
+                        idx -= 2
+                        continue
+
+                    if unquoted in self._protected:
+                        ret.extend(pct)
+                    elif unquoted in safe:
+                        ret.append(ord(unquoted))
+                    else:
+                        ret.extend(pct)
+                    pct.clear()
+
+                # special case, if we have only one char after "%"
+                elif len(pct) == 2 and idx == len(bval):
+                    ret.extend(b"%25")
+                    pct.clear()
+                    idx -= 1
+
+                continue
+
+            elif ch == ord("%") and self._requote:
+                pct.clear()
+                pct.append(ch)
+
+                # special case if "%" is last char
+                if idx == len(bval):
+                    ret.extend(b"%25")
+
+                continue
+
+            if self._qs:
+                if ch == ord(" "):
+                    ret.append(ord("+"))
+                    continue
+            if ch in bsafe:
+                ret.append(ch)
+                continue
+
+            ret.extend((f"%{ch:02X}").encode("ascii"))
+
+        ret2 = ret.decode("ascii")
+        if ret2 == val:
+            return val
+        return ret2
+
+
+class _Unquoter:
+    def __init__(self, *, unsafe: str = "", qs: bool = False) -> None:
+        self._unsafe = unsafe
+        self._qs = qs
+        self._quoter = _Quoter()
+        self._qs_quoter = _Quoter(qs=True)
+
+    def __call__(self, val: Optional[str]) -> Optional[str]:
+        if val is None:
+            return None
+        if not isinstance(val, str):
+            raise TypeError("Argument should be str")
+        if not val:
+            return ""
+        decoder = cast(codecs.BufferedIncrementalDecoder, utf8_decoder())
+        ret = []
+        idx = 0
+        while idx < len(val):
+            ch = val[idx]
+            idx += 1
+            if ch == "%" and idx <= len(val) - 2:
+                pct = val[idx : idx + 2]
+                if _IS_HEX_STR.fullmatch(pct):
+                    b = bytes([int(pct, base=16)])
+                    idx += 2
+                    try:
+                        unquoted = decoder.decode(b)
+                    except UnicodeDecodeError:
+                        start_pct = idx - 3 - len(decoder.buffer) * 3
+                        ret.append(val[start_pct : idx - 3])
+                        decoder.reset()
+                        try:
+                            unquoted = decoder.decode(b)
+                        except UnicodeDecodeError:
+                            ret.append(val[idx - 3 : idx])
+                            continue
+                    if not unquoted:
+                        continue
+                    if self._qs and unquoted in "+=&;":
+                        to_add = self._qs_quoter(unquoted)
+                        if to_add is None:  # pragma: no cover
+                            raise RuntimeError("Cannot quote None")
+                        ret.append(to_add)
+                    elif unquoted in self._unsafe:
+                        to_add = self._quoter(unquoted)
+                        if to_add is None:  # pragma: no cover
+                            raise RuntimeError("Cannot quote None")
+                        ret.append(to_add)
+                    else:
+                        ret.append(unquoted)
+                    continue
+
+            if decoder.buffer:
+                start_pct = idx - 1 - len(decoder.buffer) * 3
+                ret.append(val[start_pct : idx - 1])
+                decoder.reset()
+
+            if ch == "+":
+                if not self._qs or ch in self._unsafe:
+                    ret.append("+")
+                else:
+                    ret.append(" ")
+                continue
+
+            if ch in self._unsafe:
+                ret.append("%")
+                h = hex(ord(ch)).upper()[2:]
+                for ch in h:
+                    ret.append(ch)
+                continue
+
+            ret.append(ch)
+
+        if decoder.buffer:
+            ret.append(val[-len(decoder.buffer) * 3 :])
+
+        ret2 = "".join(ret)
+        if ret2 == val:
+            return val
+        return ret2
diff --git a/yarl/_url.py b/yarl/_url.py
new file mode 100644
index 0000000..3e1c1a7
--- /dev/null
+++ b/yarl/_url.py
@@ -0,0 +1,1197 @@
+import functools
+import math
+import warnings
+from collections.abc import Mapping, Sequence
+from contextlib import suppress
+from ipaddress import ip_address
+from urllib.parse import SplitResult, parse_qsl, quote, urljoin, urlsplit, urlunsplit
+
+import idna
+from multidict import MultiDict, MultiDictProxy
+
+from ._quoting import _Quoter, _Unquoter
+
+DEFAULT_PORTS = {"http": 80, "https": 443, "ws": 80, "wss": 443}
+
+sentinel = object()
+
+
+def rewrite_module(obj: object) -> object:
+    obj.__module__ = "yarl"
+    return obj
+
+
+class cached_property:
+    """Use as a class method decorator.  It operates almost exactly like
+    the Python `@property` decorator, but it puts the result of the
+    method it decorates into the instance dict after the first call,
+    effectively replacing the function it decorates with an instance
+    variable.  It is, in Python parlance, a data descriptor.
+
+    """
+
+    def __init__(self, wrapped):
+        self.wrapped = wrapped
+        try:
+            self.__doc__ = wrapped.__doc__
+        except AttributeError:  # pragma: no cover
+            self.__doc__ = ""
+        self.name = wrapped.__name__
+
+    def __get__(self, inst, owner, _sentinel=sentinel):
+        if inst is None:
+            return self
+        val = inst._cache.get(self.name, _sentinel)
+        if val is not _sentinel:
+            return val
+        val = self.wrapped(inst)
+        inst._cache[self.name] = val
+        return val
+
+    def __set__(self, inst, value):
+        raise AttributeError("cached property is read-only")
+
+
+def _normalize_path_segments(segments):
+    """Drop '.' and '..' from a sequence of str segments"""
+
+    resolved_path = []
+
+    for seg in segments:
+        if seg == "..":
+            # ignore any .. segments that would otherwise cause an
+            # IndexError when popped from resolved_path if
+            # resolving for rfc3986
+            with suppress(IndexError):
+                resolved_path.pop()
+        elif seg != ".":
+            resolved_path.append(seg)
+
+    if segments and segments[-1] in (".", ".."):
+        # do some post-processing here.
+        # if the last segment was a relative dir,
+        # then we need to append the trailing '/'
+        resolved_path.append("")
+
+    return resolved_path
+
+
+@rewrite_module
+class URL:
+    # Don't derive from str
+    # follow pathlib.Path design
+    # probably URL will not suffer from pathlib problems:
+    # it's intended for libraries like aiohttp,
+    # not to be passed into standard library functions like os.open etc.
+
+    # URL grammar (RFC 3986)
+    # pct-encoded = "%" HEXDIG HEXDIG
+    # reserved    = gen-delims / sub-delims
+    # gen-delims  = ":" / "/" / "?" / "#" / "[" / "]" / "@"
+    # sub-delims  = "!" / "$" / "&" / "'" / "(" / ")"
+    #             / "*" / "+" / "," / ";" / "="
+    # unreserved  = ALPHA / DIGIT / "-" / "." / "_" / "~"
+    # URI         = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
+    # hier-part   = "//" authority path-abempty
+    #             / path-absolute
+    #             / path-rootless
+    #             / path-empty
+    # scheme      = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
+    # authority   = [ userinfo "@" ] host [ ":" port ]
+    # userinfo    = *( unreserved / pct-encoded / sub-delims / ":" )
+    # host        = IP-literal / IPv4address / reg-name
+    # IP-literal = "[" ( IPv6address / IPvFuture  ) "]"
+    # IPvFuture  = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
+    # IPv6address =                            6( h16 ":" ) ls32
+    #             /                       "::" 5( h16 ":" ) ls32
+    #             / [               h16 ] "::" 4( h16 ":" ) ls32
+    #             / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32
+    #             / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32
+    #             / [ *3( h16 ":" ) h16 ] "::"    h16 ":"   ls32
+    #             / [ *4( h16 ":" ) h16 ] "::"              ls32
+    #             / [ *5( h16 ":" ) h16 ] "::"              h16
+    #             / [ *6( h16 ":" ) h16 ] "::"
+    # ls32        = ( h16 ":" h16 ) / IPv4address
+    #             ; least-significant 32 bits of address
+    # h16         = 1*4HEXDIG
+    #             ; 16 bits of address represented in hexadecimal
+    # IPv4address = dec-octet "." dec-octet "." dec-octet "." dec-octet
+    # dec-octet   = DIGIT                 ; 0-9
+    #             / %x31-39 DIGIT         ; 10-99
+    #             / "1" 2DIGIT            ; 100-199
+    #             / "2" %x30-34 DIGIT     ; 200-249
+    #             / "25" %x30-35          ; 250-255
+    # reg-name    = *( unreserved / pct-encoded / sub-delims )
+    # port        = *DIGIT
+    # path          = path-abempty    ; begins with "/" or is empty
+    #               / path-absolute   ; begins with "/" but not "//"
+    #               / path-noscheme   ; begins with a non-colon segment
+    #               / path-rootless   ; begins with a segment
+    #               / path-empty      ; zero characters
+    # path-abempty  = *( "/" segment )
+    # path-absolute = "/" [ segment-nz *( "/" segment ) ]
+    # path-noscheme = segment-nz-nc *( "/" segment )
+    # path-rootless = segment-nz *( "/" segment )
+    # path-empty    = 0<pchar>
+    # segment       = *pchar
+    # segment-nz    = 1*pchar
+    # segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" )
+    #               ; non-zero-length segment without any colon ":"
+    # pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
+    # query       = *( pchar / "/" / "?" )
+    # fragment    = *( pchar / "/" / "?" )
+    # URI-reference = URI / relative-ref
+    # relative-ref  = relative-part [ "?" query ] [ "#" fragment ]
+    # relative-part = "//" authority path-abempty
+    #               / path-absolute
+    #               / path-noscheme
+    #               / path-empty
+    # absolute-URI  = scheme ":" hier-part [ "?" query ]
+    __slots__ = ("_cache", "_val")
+
+    _QUOTER = _Quoter(requote=False)
+    _REQUOTER = _Quoter()
+    _PATH_QUOTER = _Quoter(safe="@:", protected="/+", requote=False)
+    _PATH_REQUOTER = _Quoter(safe="@:", protected="/+")
+    _QUERY_QUOTER = _Quoter(safe="?/:@", protected="=+&;", qs=True, requote=False)
+    _QUERY_REQUOTER = _Quoter(safe="?/:@", protected="=+&;", qs=True)
+    _QUERY_PART_QUOTER = _Quoter(safe="?/:@", qs=True, requote=False)
+    _FRAGMENT_QUOTER = _Quoter(safe="?/:@", requote=False)
+    _FRAGMENT_REQUOTER = _Quoter(safe="?/:@")
+
+    _UNQUOTER = _Unquoter()
+    _PATH_UNQUOTER = _Unquoter(unsafe="+")
+    _QS_UNQUOTER = _Unquoter(qs=True)
+
+    def __new__(cls, val="", *, encoded=False, strict=None):
+        if strict is not None:  # pragma: no cover
+            warnings.warn("strict parameter is ignored")
+        if type(val) is cls:
+            return val
+        if type(val) is str:
+            val = urlsplit(val)
+        elif type(val) is SplitResult:
+            if not encoded:
+                raise ValueError("Cannot apply decoding to SplitResult")
+        elif isinstance(val, str):
+            val = urlsplit(str(val))
+        else:
+            raise TypeError("Constructor parameter should be str")
+
+        if not encoded:
+            if not val[1]:  # netloc
+                netloc = ""
+                host = ""
+            else:
+                host = val.hostname
+                if host is None:
+                    raise ValueError("Invalid URL: host is required for absolute urls")
+
+                try:
+                    port = val.port
+                except ValueError as e:
+                    raise ValueError(
+                        "Invalid URL: port can't be converted to integer"
+                    ) from e
+
+                netloc = cls._make_netloc(
+                    val.username, val.password, host, port, encode=True, requote=True
+                )
+            path = cls._PATH_REQUOTER(val[2])
+            if netloc:
+                path = cls._normalize_path(path)
+
+            cls._validate_authority_uri_abs_path(host=host, path=path)
+            query = cls._QUERY_REQUOTER(val[3])
+            fragment = cls._FRAGMENT_REQUOTER(val[4])
+            val = SplitResult(val[0], netloc, path, query, fragment)
+
+        self = object.__new__(cls)
+        self._val = val
+        self._cache = {}
+        return self
+
+    @classmethod
+    def build(
+        cls,
+        *,
+        scheme="",
+        authority="",
+        user=None,
+        password=None,
+        host="",
+        port=None,
+        path="",
+        query=None,
+        query_string="",
+        fragment="",
+        encoded=False,
+    ):
+        """Creates and returns a new URL"""
+
+        if authority and (user or password or host or port):
+            raise ValueError(
+                'Can\'t mix "authority" with "user", "password", "host" or "port".'
+            )
+        if port and not host:
+            raise ValueError('Can\'t build URL with "port" but without "host".')
+        if query and query_string:
+            raise ValueError('Only one of "query" or "query_string" should be passed')
+        if (
+            scheme is None
+            or authority is None
+            or host is None
+            or path is None
+            or query_string is None
+            or fragment is None
+        ):
+            raise TypeError(
+                'NoneType is illegal for "scheme", "authority", "host", "path", '
+                '"query_string", and "fragment" args, use empty string instead.'
+            )
+
+        if authority:
+            if encoded:
+                netloc = authority
+            else:
+                tmp = SplitResult("", authority, "", "", "")
+                netloc = cls._make_netloc(
+                    tmp.username, tmp.password, tmp.hostname, tmp.port, encode=True
+                )
+        elif not user and not password and not host and not port:
+            netloc = ""
+        else:
+            netloc = cls._make_netloc(
+                user, password, host, port, encode=not encoded, encode_host=not encoded
+            )
+        if not encoded:
+            path = cls._PATH_QUOTER(path)
+            if netloc:
+                path = cls._normalize_path(path)
+
+            cls._validate_authority_uri_abs_path(host=host, path=path)
+            query_string = cls._QUERY_QUOTER(query_string)
+            fragment = cls._FRAGMENT_QUOTER(fragment)
+
+        url = cls(
+            SplitResult(scheme, netloc, path, query_string, fragment), encoded=True
+        )
+
+        if query:
+            return url.with_query(query)
+        else:
+            return url
+
+    def __init_subclass__(cls):
+        raise TypeError(f"Inheriting a class {cls!r} from URL is forbidden")
+
+    def __str__(self):
+        val = self._val
+        if not val.path and self.is_absolute() and (val.query or val.fragment):
+            val = val._replace(path="/")
+        return urlunsplit(val)
+
+    def __repr__(self):
+        return f"{self.__class__.__name__}('{str(self)}')"
+
+    def __bytes__(self):
+        return str(self).encode("ascii")
+
+    def __eq__(self, other):
+        if not type(other) is URL:
+            return NotImplemented
+
+        val1 = self._val
+        if not val1.path and self.is_absolute():
+            val1 = val1._replace(path="/")
+
+        val2 = other._val
+        if not val2.path and other.is_absolute():
+            val2 = val2._replace(path="/")
+
+        return val1 == val2
+
+    def __hash__(self):
+        ret = self._cache.get("hash")
+        if ret is None:
+            val = self._val
+            if not val.path and self.is_absolute():
+                val = val._replace(path="/")
+            ret = self._cache["hash"] = hash(val)
+        return ret
+
+    def __le__(self, other):
+        if not type(other) is URL:
+            return NotImplemented
+        return self._val <= other._val
+
+    def __lt__(self, other):
+        if not type(other) is URL:
+            return NotImplemented
+        return self._val < other._val
+
+    def __ge__(self, other):
+        if not type(other) is URL:
+            return NotImplemented
+        return self._val >= other._val
+
+    def __gt__(self, other):
+        if not type(other) is URL:
+            return NotImplemented
+        return self._val > other._val
+
+    def __truediv__(self, name):
+        if not type(name) is str:
+            return NotImplemented
+        return self._make_child((name,))
+
+    def __mod__(self, query):
+        return self.update_query(query)
+
+    def __bool__(self) -> bool:
+        return bool(
+            self._val.netloc or self._val.path or self._val.query or self._val.fragment
+        )
+
+    def __getstate__(self):
+        return (self._val,)
+
+    def __setstate__(self, state):
+        if state[0] is None and isinstance(state[1], dict):
+            # default style pickle
+            self._val = state[1]["_val"]
+        else:
+            self._val, *unused = state
+        self._cache = {}
+
+    def is_absolute(self):
+        """A check for absolute URLs.
+
+        Return True for absolute ones (having scheme or starting
+        with //), False otherwise.
+
+        """
+        return self.raw_host is not None
+
+    def is_default_port(self):
+        """A check for default port.
+
+        Return True if port is default for specified scheme,
+        e.g. 'http://python.org' or 'http://python.org:80', False
+        otherwise.
+
+        """
+        if self.port is None:
+            return False
+        default = DEFAULT_PORTS.get(self.scheme)
+        if default is None:
+            return False
+        return self.port == default
+
+    def origin(self):
+        """Return an URL with scheme, host and port parts only.
+
+        user, password, path, query and fragment are removed.
+
+        """
+        # TODO: add a keyword-only option for keeping user/pass maybe?
+        if not self.is_absolute():
+            raise ValueError("URL should be absolute")
+        if not self._val.scheme:
+            raise ValueError("URL should have scheme")
+        v = self._val
+        netloc = self._make_netloc(None, None, v.hostname, v.port)
+        val = v._replace(netloc=netloc, path="", query="", fragment="")
+        return URL(val, encoded=True)
+
+    def relative(self):
+        """Return a relative part of the URL.
+
+        scheme, user, password, host and port are removed.
+
+        """
+        if not self.is_absolute():
+            raise ValueError("URL should be absolute")
+        val = self._val._replace(scheme="", netloc="")
+        return URL(val, encoded=True)
+
+    @property
+    def scheme(self):
+        """Scheme for absolute URLs.
+
+        Empty string for relative URLs or URLs starting with //
+
+        """
+        return self._val.scheme
+
+    @property
+    def raw_authority(self):
+        """Encoded authority part of URL.
+
+        Empty string for relative URLs.
+
+        """
+        return self._val.netloc
+
+    @cached_property
+    def authority(self):
+        """Decoded authority part of URL.
+
+        Empty string for relative URLs.
+
+        """
+        return self._make_netloc(
+            self.user, self.password, self.host, self.port, encode_host=False
+        )
+
+    @property
+    def raw_user(self):
+        """Encoded user part of URL.
+
+        None if user is missing.
+
+        """
+        # not .username
+        ret = self._val.username
+        if not ret:
+            return None
+        return ret
+
+    @cached_property
+    def user(self):
+        """Decoded user part of URL.
+
+        None if user is missing.
+
+        """
+        return self._UNQUOTER(self.raw_user)
+
+    @property
+    def raw_password(self):
+        """Encoded password part of URL.
+
+        None if password is missing.
+
+        """
+        return self._val.password
+
+    @cached_property
+    def password(self):
+        """Decoded password part of URL.
+
+        None if password is missing.
+
+        """
+        return self._UNQUOTER(self.raw_password)
+
+    @property
+    def raw_host(self):
+        """Encoded host part of URL.
+
+        None for relative URLs.
+
+        """
+        # Use host instead of hostname for sake of shortness
+        # May add .hostname prop later
+        return self._val.hostname
+
+    @cached_property
+    def host(self):
+        """Decoded host part of URL.
+
+        None for relative URLs.
+
+        """
+        raw = self.raw_host
+        if raw is None:
+            return None
+        if "%" in raw:
+            # Hack for scoped IPv6 addresses like
+            # fe80::2%Проверка
+            # presence of '%' sign means only IPv6 address, so idna is useless.
+            return raw
+        return _idna_decode(raw)
+
+    @property
+    def port(self):
+        """Port part of URL, with scheme-based fallback.
+
+        None for relative URLs or URLs without explicit port and
+        scheme without default port substitution.
+
+        """
+        return self._val.port or DEFAULT_PORTS.get(self._val.scheme)
+
+    @property
+    def explicit_port(self):
+        """Port part of URL, without scheme-based fallback.
+
+        None for relative URLs or URLs without explicit port.
+
+        """
+        return self._val.port
+
+    @property
+    def raw_path(self):
+        """Encoded path of URL.
+
+        / for absolute URLs without path part.
+
+        """
+        ret = self._val.path
+        if not ret and self.is_absolute():
+            ret = "/"
+        return ret
+
+    @cached_property
+    def path(self):
+        """Decoded path of URL.
+
+        / for absolute URLs without path part.
+
+        """
+        return self._PATH_UNQUOTER(self.raw_path)
+
+    @cached_property
+    def query(self):
+        """A MultiDictProxy representing parsed query parameters in decoded
+        representation.
+
+        Empty value if URL has no query part.
+
+        """
+        ret = MultiDict(parse_qsl(self.raw_query_string, keep_blank_values=True))
+        return MultiDictProxy(ret)
+
+    @property
+    def raw_query_string(self):
+        """Encoded query part of URL.
+
+        Empty string if query is missing.
+
+        """
+        return self._val.query
+
+    @cached_property
+    def query_string(self):
+        """Decoded query part of URL.
+
+        Empty string if query is missing.
+
+        """
+        return self._QS_UNQUOTER(self.raw_query_string)
+
+    @cached_property
+    def path_qs(self):
+        """Decoded path of URL with query."""
+        if not self.query_string:
+            return self.path
+        return f"{self.path}?{self.query_string}"
+
+    @cached_property
+    def raw_path_qs(self):
+        """Encoded path of URL with query."""
+        if not self.raw_query_string:
+            return self.raw_path
+        return f"{self.raw_path}?{self.raw_query_string}"
+
+    @property
+    def raw_fragment(self):
+        """Encoded fragment part of URL.
+
+        Empty string if fragment is missing.
+
+        """
+        return self._val.fragment
+
+    @cached_property
+    def fragment(self):
+        """Decoded fragment part of URL.
+
+        Empty string if fragment is missing.
+
+        """
+        return self._UNQUOTER(self.raw_fragment)
+
+    @cached_property
+    def raw_parts(self):
+        """A tuple containing encoded *path* parts.
+
+        ('/',) for absolute URLs if *path* is missing.
+
+        """
+        path = self._val.path
+        if self.is_absolute():
+            if not path:
+                parts = ["/"]
+            else:
+                parts = ["/"] + path[1:].split("/")
+        else:
+            if path.startswith("/"):
+                parts = ["/"] + path[1:].split("/")
+            else:
+                parts = path.split("/")
+        return tuple(parts)
+
+    @cached_property
+    def parts(self):
+        """A tuple containing decoded *path* parts.
+
+        ('/',) for absolute URLs if *path* is missing.
+
+        """
+        return tuple(self._UNQUOTER(part) for part in self.raw_parts)
+
+    @cached_property
+    def parent(self):
+        """A new URL with last part of path removed and cleaned up query and
+        fragment.
+
+        """
+        path = self.raw_path
+        if not path or path == "/":
+            if self.raw_fragment or self.raw_query_string:
+                return URL(self._val._replace(query="", fragment=""), encoded=True)
+            return self
+        parts = path.split("/")
+        val = self._val._replace(path="/".join(parts[:-1]), query="", fragment="")
+        return URL(val, encoded=True)
+
+    @cached_property
+    def raw_name(self):
+        """The last part of raw_parts."""
+        parts = self.raw_parts
+        if self.is_absolute():
+            parts = parts[1:]
+            if not parts:
+                return ""
+            else:
+                return parts[-1]
+        else:
+            return parts[-1]
+
+    @cached_property
+    def name(self):
+        """The last part of parts."""
+        return self._UNQUOTER(self.raw_name)
+
+    @cached_property
+    def raw_suffix(self):
+        name = self.raw_name
+        i = name.rfind(".")
+        if 0 < i < len(name) - 1:
+            return name[i:]
+        else:
+            return ""
+
+    @cached_property
+    def suffix(self):
+        return self._UNQUOTER(self.raw_suffix)
+
+    @cached_property
+    def raw_suffixes(self):
+        name = self.raw_name
+        if name.endswith("."):
+            return ()
+        name = name.lstrip(".")
+        return tuple("." + suffix for suffix in name.split(".")[1:])
+
+    @cached_property
+    def suffixes(self):
+        return tuple(self._UNQUOTER(suffix) for suffix in self.raw_suffixes)
+
+    @staticmethod
+    def _validate_authority_uri_abs_path(host, path):
+        """Ensure that path in URL with authority starts with a leading slash.
+
+        Raise ValueError if not.
+        """
+        if len(host) > 0 and len(path) > 0 and not path.startswith("/"):
+            raise ValueError(
+                "Path in a URL with authority should start with a slash ('/') if set"
+            )
+
+    def _make_child(self, segments, encoded=False):
+        """add segments to self._val.path, accounting for absolute vs relative paths"""
+        parsed = []
+        for seg in reversed(segments):
+            if not seg:
+                continue
+            if seg[0] == "/":
+                raise ValueError(
+                    f"Appending path {seg!r} starting from slash is forbidden"
+                )
+            seg = seg if encoded else self._PATH_QUOTER(seg)
+            if "/" in seg:
+                parsed += (
+                    sub for sub in reversed(seg.split("/")) if sub and sub != "."
+                )
+            elif seg != ".":
+                parsed.append(seg)
+        parsed.reverse()
+        old_path = self._val.path
+        if old_path:
+            parsed = [*old_path.rstrip("/").split("/"), *parsed]
+        if self.is_absolute():
+            parsed = _normalize_path_segments(parsed)
+            if parsed and parsed[0] != "":
+                # inject a leading slash when adding a path to an absolute URL
+                # where there was none before
+                parsed = ["", *parsed]
+        new_path = "/".join(parsed)
+        return URL(
+            self._val._replace(path=new_path, query="", fragment=""), encoded=True
+        )
+
+    @classmethod
+    def _normalize_path(cls, path):
+        # Drop '.' and '..' from str path
+
+        prefix = ""
+        if path.startswith("/"):
+            # preserve the "/" root element of absolute paths, copying it to the
+            # normalised output as per sections 5.2.4 and 6.2.2.3 of rfc3986.
+            prefix = "/"
+            path = path[1:]
+
+        segments = path.split("/")
+        return prefix + "/".join(_normalize_path_segments(segments))
+
+    @classmethod
+    def _encode_host(cls, host, human=False):
+        try:
+            ip, sep, zone = host.partition("%")
+            ip = ip_address(ip)
+        except ValueError:
+            host = host.lower()
+            # IDNA encoding is slow,
+            # skip it for ASCII-only strings
+            # Don't move the check into _idna_encode() helper
+            # to reduce the cache size
+            if human or host.isascii():
+                return host
+            host = _idna_encode(host)
+        else:
+            host = ip.compressed
+            if sep:
+                host += "%" + zone
+            if ip.version == 6:
+                host = "[" + host + "]"
+        return host
+
+    @classmethod
+    def _make_netloc(
+        cls, user, password, host, port, encode=False, encode_host=True, requote=False
+    ):
+        quoter = cls._REQUOTER if requote else cls._QUOTER
+        if encode_host:
+            ret = cls._encode_host(host)
+        else:
+            ret = host
+        if port is not None:
+            ret = ret + ":" + str(port)
+        if password is not None:
+            if not user:
+                user = ""
+            else:
+                if encode:
+                    user = quoter(user)
+            if encode:
+                password = quoter(password)
+            user = user + ":" + password
+        elif user and encode:
+            user = quoter(user)
+        if user:
+            ret = user + "@" + ret
+        return ret
+
+    def with_scheme(self, scheme):
+        """Return a new URL with scheme replaced."""
+        # N.B. doesn't cleanup query/fragment
+        if not isinstance(scheme, str):
+            raise TypeError("Invalid scheme type")
+        if not self.is_absolute():
+            raise ValueError("scheme replacement is not allowed for relative URLs")
+        return URL(self._val._replace(scheme=scheme.lower()), encoded=True)
+
+    def with_user(self, user):
+        """Return a new URL with user replaced.
+
+        Autoencode user if needed.
+
+        Clear user/password if user is None.
+
+        """
+        # N.B. doesn't cleanup query/fragment
+        val = self._val
+        if user is None:
+            password = None
+        elif isinstance(user, str):
+            user = self._QUOTER(user)
+            password = val.password
+        else:
+            raise TypeError("Invalid user type")
+        if not self.is_absolute():
+            raise ValueError("user replacement is not allowed for relative URLs")
+        return URL(
+            self._val._replace(
+                netloc=self._make_netloc(user, password, val.hostname, val.port)
+            ),
+            encoded=True,
+        )
+
+    def with_password(self, password):
+        """Return a new URL with password replaced.
+
+        Autoencode password if needed.
+
+        Clear password if argument is None.
+
+        """
+        # N.B. doesn't cleanup query/fragment
+        if password is None:
+            pass
+        elif isinstance(password, str):
+            password = self._QUOTER(password)
+        else:
+            raise TypeError("Invalid password type")
+        if not self.is_absolute():
+            raise ValueError("password replacement is not allowed for relative URLs")
+        val = self._val
+        return URL(
+            self._val._replace(
+                netloc=self._make_netloc(val.username, password, val.hostname, val.port)
+            ),
+            encoded=True,
+        )
+
+    def with_host(self, host):
+        """Return a new URL with host replaced.
+
+        Autoencode host if needed.
+
+        Changing host for relative URLs is not allowed, use .join()
+        instead.
+
+        """
+        # N.B. doesn't cleanup query/fragment
+        if not isinstance(host, str):
+            raise TypeError("Invalid host type")
+        if not self.is_absolute():
+            raise ValueError("host replacement is not allowed for relative URLs")
+        if not host:
+            raise ValueError("host removing is not allowed")
+        val = self._val
+        return URL(
+            self._val._replace(
+                netloc=self._make_netloc(val.username, val.password, host, val.port)
+            ),
+            encoded=True,
+        )
+
+    def with_port(self, port):
+        """Return a new URL with port replaced.
+
+        Clear port to default if None is passed.
+
+        """
+        # N.B. doesn't cleanup query/fragment
+        if port is not None:
+            if isinstance(port, bool) or not isinstance(port, int):
+                raise TypeError(f"port should be int or None, got {type(port)}")
+            if port < 0 or port > 65535:
+                raise ValueError(f"port must be between 0 and 65535, got {port}")
+        if not self.is_absolute():
+            raise ValueError("port replacement is not allowed for relative URLs")
+        val = self._val
+        return URL(
+            self._val._replace(
+                netloc=self._make_netloc(val.username, val.password, val.hostname, port)
+            ),
+            encoded=True,
+        )
+
+    def with_path(self, path, *, encoded=False):
+        """Return a new URL with path replaced."""
+        if not encoded:
+            path = self._PATH_QUOTER(path)
+            if self.is_absolute():
+                path = self._normalize_path(path)
+        if len(path) > 0 and path[0] != "/":
+            path = "/" + path
+        return URL(self._val._replace(path=path, query="", fragment=""), encoded=True)
+
+    @classmethod
+    def _query_seq_pairs(cls, quoter, pairs):
+        for key, val in pairs:
+            if isinstance(val, (list, tuple)):
+                for v in val:
+                    yield quoter(key) + "=" + quoter(cls._query_var(v))
+            else:
+                yield quoter(key) + "=" + quoter(cls._query_var(val))
+
+    @staticmethod
+    def _query_var(v):
+        cls = type(v)
+        if issubclass(cls, str):
+            return v
+        if issubclass(cls, float):
+            if math.isinf(v):
+                raise ValueError("float('inf') is not supported")
+            if math.isnan(v):
+                raise ValueError("float('nan') is not supported")
+            return str(float(v))
+        if issubclass(cls, int) and cls is not bool:
+            return str(int(v))
+        raise TypeError(
+            "Invalid variable type: value "
+            "should be str, int or float, got {!r} "
+            "of type {}".format(v, cls)
+        )
+
+    def _get_str_query(self, *args, **kwargs):
+        if kwargs:
+            if len(args) > 0:
+                raise ValueError(
+                    "Either kwargs or single query parameter must be present"
+                )
+            query = kwargs
+        elif len(args) == 1:
+            query = args[0]
+        else:
+            raise ValueError("Either kwargs or single query parameter must be present")
+
+        if query is None:
+            query = None
+        elif isinstance(query, Mapping):
+            quoter = self._QUERY_PART_QUOTER
+            query = "&".join(self._query_seq_pairs(quoter, query.items()))
+        elif isinstance(query, str):
+            query = self._QUERY_QUOTER(query)
+        elif isinstance(query, (bytes, bytearray, memoryview)):
+            raise TypeError(
+                "Invalid query type: bytes, bytearray and memoryview are forbidden"
+            )
+        elif isinstance(query, Sequence):
+            quoter = self._QUERY_PART_QUOTER
+            # We don't expect sequence values if we're given a list of pairs
+            # already; only mappings like builtin `dict` which can't have the
+            # same key pointing to multiple values are allowed to use
+            # `_query_seq_pairs`.
+            query = "&".join(
+                quoter(k) + "=" + quoter(self._query_var(v)) for k, v in query
+            )
+        else:
+            raise TypeError(
+                "Invalid query type: only str, mapping or "
+                "sequence of (key, value) pairs is allowed"
+            )
+
+        return query
+
+    def with_query(self, *args, **kwargs):
+        """Return a new URL with query part replaced.
+
+        Accepts any Mapping (e.g. dict, multidict.MultiDict instances)
+        or str, autoencode the argument if needed.
+
+        A sequence of (key, value) pairs is supported as well.
+
+        It also can take an arbitrary number of keyword arguments.
+
+        Clear query if None is passed.
+
+        """
+        # N.B. doesn't cleanup query/fragment
+
+        new_query = self._get_str_query(*args, **kwargs) or ""
+        return URL(
+            self._val._replace(path=self._val.path, query=new_query), encoded=True
+        )
+
+    def update_query(self, *args, **kwargs):
+        """Return a new URL with query part updated."""
+        s = self._get_str_query(*args, **kwargs)
+        query = None
+        if s is not None:
+            new_query = MultiDict(parse_qsl(s, keep_blank_values=True))
+            query = MultiDict(self.query)
+            query.update(new_query)
+
+        return URL(
+            self._val._replace(query=self._get_str_query(query) or ""), encoded=True
+        )
+
+    def with_fragment(self, fragment):
+        """Return a new URL with fragment replaced.
+
+        Autoencode fragment if needed.
+
+        Clear fragment to default if None is passed.
+
+        """
+        # N.B. doesn't cleanup query/fragment
+        if fragment is None:
+            raw_fragment = ""
+        elif not isinstance(fragment, str):
+            raise TypeError("Invalid fragment type")
+        else:
+            raw_fragment = self._FRAGMENT_QUOTER(fragment)
+        if self.raw_fragment == raw_fragment:
+            return self
+        return URL(self._val._replace(fragment=raw_fragment), encoded=True)
+
+    def with_name(self, name):
+        """Return a new URL with name (last part of path) replaced.
+
+        Query and fragment parts are cleaned up.
+
+        Name is encoded if needed.
+
+        """
+        # N.B. DOES cleanup query/fragment
+        if not isinstance(name, str):
+            raise TypeError("Invalid name type")
+        if "/" in name:
+            raise ValueError("Slash in name is not allowed")
+        name = self._PATH_QUOTER(name)
+        if name in (".", ".."):
+            raise ValueError(". and .. values are forbidden")
+        parts = list(self.raw_parts)
+        if self.is_absolute():
+            if len(parts) == 1:
+                parts.append(name)
+            else:
+                parts[-1] = name
+            parts[0] = ""  # replace leading '/'
+        else:
+            parts[-1] = name
+            if parts[0] == "/":
+                parts[0] = ""  # replace leading '/'
+        return URL(
+            self._val._replace(path="/".join(parts), query="", fragment=""),
+            encoded=True,
+        )
+
+    def with_suffix(self, suffix):
+        """Return a new URL with suffix (file extension of name) replaced.
+
+        Query and fragment parts are cleaned up.
+
+        suffix is encoded if needed.
+        """
+        if not isinstance(suffix, str):
+            raise TypeError("Invalid suffix type")
+        if suffix and not suffix.startswith(".") or suffix == ".":
+            raise ValueError(f"Invalid suffix {suffix!r}")
+        name = self.raw_name
+        if not name:
+            raise ValueError(f"{self!r} has an empty name")
+        old_suffix = self.raw_suffix
+        if not old_suffix:
+            name = name + suffix
+        else:
+            name = name[: -len(old_suffix)] + suffix
+        return self.with_name(name)
+
+    def join(self, url):
+        """Join URLs
+
+        Construct a full (“absolute”) URL by combining a “base URL”
+        (self) with another URL (url).
+
+        Informally, this uses components of the base URL, in
+        particular the addressing scheme, the network location and
+        (part of) the path, to provide missing components in the
+        relative URL.
+
+        """
+        # See docs for urllib.parse.urljoin
+        if not isinstance(url, URL):
+            raise TypeError("url should be URL")
+        return URL(urljoin(str(self), str(url)), encoded=True)
+
+    def joinpath(self, *other, encoded=False):
+        """Return a new URL with the elements in other appended to the path."""
+        return self._make_child(other, encoded=encoded)
+
+    def human_repr(self):
+        """Return decoded human readable string for URL representation."""
+        user = _human_quote(self.user, "#/:?@")
+        password = _human_quote(self.password, "#/:?@")
+        host = self.host
+        if host:
+            host = self._encode_host(self.host, human=True)
+        path = _human_quote(self.path, "#?")
+        query_string = "&".join(
+            "{}={}".format(_human_quote(k, "#&+;="), _human_quote(v, "#&+;="))
+            for k, v in self.query.items()
+        )
+        fragment = _human_quote(self.fragment, "")
+        return urlunsplit(
+            SplitResult(
+                self.scheme,
+                self._make_netloc(
+                    user,
+                    password,
+                    host,
+                    self._val.port,
+                    encode_host=False,
+                ),
+                path,
+                query_string,
+                fragment,
+            )
+        )
+
+
+def _human_quote(s, unsafe):
+    if not s:
+        return s
+    for c in "%" + unsafe:
+        if c in s:
+            s = s.replace(c, f"%{ord(c):02X}")
+    if s.isprintable():
+        return s
+    return "".join(c if c.isprintable() else quote(c) for c in s)
+
+
+_MAXCACHE = 256
+
+
+@functools.lru_cache(_MAXCACHE)
+def _idna_decode(raw):
+    try:
+        return idna.decode(raw.encode("ascii"))
+    except UnicodeError:  # e.g. '::1'
+        return raw.encode("ascii").decode("idna")
+
+
+@functools.lru_cache(_MAXCACHE)
+def _idna_encode(host):
+    try:
+        return idna.encode(host, uts46=True).decode("ascii")
+    except UnicodeError:
+        return host.encode("idna").decode("ascii")
+
+
+@rewrite_module
+def cache_clear():
+    _idna_decode.cache_clear()
+    _idna_encode.cache_clear()
+
+
+@rewrite_module
+def cache_info():
+    return {
+        "idna_encode": _idna_encode.cache_info(),
+        "idna_decode": _idna_decode.cache_info(),
+    }
+
+
+@rewrite_module
+def cache_configure(*, idna_encode_size=_MAXCACHE, idna_decode_size=_MAXCACHE):
+    global _idna_decode, _idna_encode
+
+    _idna_encode = functools.lru_cache(idna_encode_size)(_idna_encode.__wrapped__)
+    _idna_decode = functools.lru_cache(idna_decode_size)(_idna_decode.__wrapped__)
diff --git a/yarl/py.typed b/yarl/py.typed
new file mode 100644
index 0000000..dcf2c80
--- /dev/null
+++ b/yarl/py.typed
@@ -0,0 +1 @@
+# Placeholder