[issue17954] Support creation of extensible enums through metaclass subclassing

[Ethan Furman]

Ethan Furman added the comment:

I'm sure this is a dumb question, but I have lots of them so thought I'd share.

Can this issue be resolved simply by making the `_get_mixins` method `get_mixins`?

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nosy: +ethan.furman

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17954>
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