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_make_iterencode in python2.7/json/encoder.py encodes custom enum types incorrectly (the label will be printed without '"') because of these lines (line 320 in 2.7.6):
 elif isinstance(value, (int, long)):
 yield buf + str(value)
in constract, _make_iterencode in python 3 explicitly supports the enum types:
 elif isinstance(value, int):
 # Subclasses of int/float may override __str__, but we still
 # want to encode them as integers/floats in JSON. One example
 # within the standard library is IntEnum.
 yield buf + str(int(value))