[issue20679] 3.4 cherry-pick: 587fd4b91120 improve Enum subclass behavior

[Ethan Furman]

Ethan Furman added the comment:

Discussion started on PyDev.

While working on that I realized/remembered that the main reason to get this in now is that without it a user *cannot* change how pickling works -- (s)he can write the methods, but they will be ignored.

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<http://bugs.python.org/issue20679>
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