Enum is not supported by inspect.signature

[albertvillanova]

Enum is not supported by inspect.signature and raises a TypeError: unexpected object <bound method __signature__ of <aenum 'Enum'>> in __signature__ attribute

import inspect
from aenum import Enum

inspect.signature(Enum)

  File "/lib/python3.10/inspect.py", line 3254, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped,
  File "/lib/python3.10/inspect.py", line 3002, in from_callable
    return _signature_from_callable(obj, sigcls=cls,
  File "/lib/python3.10/inspect.py", line 2427, in _signature_from_callable
    raise TypeError(
TypeError: unexpected object <bound method __signature__ of <aenum 'Enum'>> in __signature__ attribute

[tjstum]

This is a regression in 3.1.13. Looks like it was caused by 6bbd6a2