[issue26521] add `extend_enum` to Enum

[Ethan Furman]

Ethan Furman added the comment:

Barry:  po-tay-to / po-tah-to   ;)

Serhiy:  The set is known and finite, just scattered over different expensive-to-load modules.

Decision:
Since no one is jumping up and down with anticipation over this feature, I'll let it stay on SO.

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resolution:  -> rejected
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26521>
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