Use raw_unicode_escape instead of base64 encoding

We can consider other encodings as well. Just need to get the bytes to
a string and back. The raw_unicode_escale appears to work.

Signed-off-by: Patrick Avery <[email protected]>

hexrd/utils/json.py

@@ -1,4 +1,3 @@
-import base64
 import io
 import json
 
@@ -27,8 +26,7 @@ def default(self, obj):
                 data = bytes_io.getvalue()
 
             return {
-                # Need to base64 encode it so it is json-valid
-                ndarray_key: base64.b64encode(data).decode('ascii')
+                ndarray_key: data.decode('raw_unicode_escape')
             }
 
         return super().default(obj)
@@ -44,7 +42,7 @@ def __init__(self, *args, **kwargs):
 
     def object_hook(self, obj):
         if ndarray_key in obj:
-            data = base64.b64decode(obj[ndarray_key])
+            data = obj[ndarray_key].encode('raw_unicode_escape')
             with io.BytesIO(data) as bytes_io:
                 return np.load(bytes_io)