[issue44342] enum with inherited type won't pickle

[Ethan Furman]

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

Changing `__reduce_ex__` is too big a change for 3.9, so making the search for pickle support more robust there.

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