[issue23591] Add IntFlags

[Ethan Furman]

Ethan Furman added the comment:

The current patch is more along the lines of a proof-of-concept.

The final IntFlag type (if there is one) would be quite a bit more extensive since part of the reason for its existence is to not lose type -- so pretty much every __op__ would have to be overridden.

Agreed about the repr() and str(), though.

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<http://bugs.python.org/issue23591>
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