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

[Ethan Furman]

Ethan Furman added the comment:

So, which is better?

To have a @unique class decorator as part of the module, or to have a UniqueEnum recipe in the docs?

A decorator is immediately usable, but requires remembering an extra line of code.

An example requires being put into a local utility module, but also serves as a guide to customising Enums.  (Took be about five tries to get it right. :/ )

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