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

[Ethan Furman]

Ethan Furman added the comment:

Thanks, Larry.  I'll have one more patch which will be much better comments in the code, and a small doc enhancement.  When it's ready should I reopen this issue or create a new one?

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