[issue23591] enum: Add Flags and IntFlags

[Roundup Robot]

Roundup Robot added the comment:

New changeset f33fc2117bb2 by Ethan Furman in branch 'default':
issue23591: bool(empty_flags) == False; more docs & tests
https://hg.python.org/cpython/rev/f33fc2117bb2

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