[issue23591] Add IntFlags

[Ethan Furman]

Ethan Furman added the comment:

Just look briefly through your patches, and they look pretty good.  I'll take a more in-depth look in the next couple weeks.  (Feel free to ping again if you don't see any activity from me, and thanks for your patience.)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23591>
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