[issue21706] Add base for enumerations (Functional API)

[Dmitry Korchemny]

Dmitry Korchemny added the comment:

I think that the situation when you want start numbering from 0 is rather common, especially when you need to define bit fields as enumeration or when you need to implement an interface with other languages (e.g., C).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21706>
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