[docs] [issue17947] Code, test, and doc review for PEP-0435 Enum

[Eli Bendersky]

Eli Bendersky added the comment:

> 2. Mike Bayer (SQL Alchemy author) has requested the ability to derive a
> custom metaclass that turns off the Enums-with-members-are-final
> subclassing restriction (relaxing the rule that members of an enum are
> instances of that enum to "members of an enum are instances of that enum,
> or one of its parent enums", but otherwise keeping the same behaviour as
> the standard enums).
>

Nick, after you read the whole code, please consider whether it's not
already complex enough even without catering to every other need out there.

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