keygroup with empty name is allowed in particular formatting, but not in what toml.dump creates.

[spokeydokeys]

Description

When using toml to store a logging dictConfig, I want to store a keygroup with a name of "" to reference the root logger. For example:

[logging]
version = 1

[logging.loggers]
"" = {level='NOTSET', handlers=[]}
"action" = {level='DEBUG', handlers=['file']}

[logging.handlers.file]
class = 'logging.handlers.RotatingFileHandler'
formatter = 'full'
level = 'DEBUG'
filename = 'action.log'
maxBytes = 52428800  # 50 * 2**20 (50 MB)
backupCount = 5

[logging.formatters.full]
format='%(asctime)s [%(levelname)s] %(name)s:%(filename)s:%(lineno)d - %(message)s'

The above works perfectly. toml.load of the above code results in the dictionary I expect. However, if this written from a dict using toml.dump, the resulting toml has a the loggers group decomposed into

[logging.loggers.""]
level='NOTSET'
handlers=[]

[logging.logger.action]
level='DEBUG'
handlers=['file']

Loading this with toml.load results in the error TomlDecodeError: Can't have a keygroup with an empty name

I store my default configurations in a pydantic BaseModel that is then dumped to dict and finally written to a toml file on installation. The above means that I can't use toml as a config format for my logging configuration as I have to go in and change the second version to the first for it to work. Ultimately I'll have to host it in another configuration format, which is unfortunate.

Request:

Either:

1. Allow the empty keygroup
2. Have toml.dump generate a file that can be read using toml.load

[spokeydokeys]

tomlkit is tolerant of this issue.