[issue44342] enum with inherited type won't pickle

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

Looking into this I think the root of the problem is the way `reduce` is handled -- currently, Enum's `__reduce_ex__` works by returning the class, and the value to use to lookup the member.  Because that lookup can fail with complex enums, EnumType will sabotage `reduce` if it can't find support in the new enum class.

However, if `__reduce_ex__` working by returning

    `getattr, (self.__class, self._name_)`

then we should be fine, as that should never fail.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44342>
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