[issue33219] x in IntFlag() should test int x's inclusion in IntFlag

[Ethan Furman]

Change by Ethan Furman <ethan at stoneleaf.us>:


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assignee:  -> ethan.furman
nosy: +barry, eli.bendersky, ethan.furman
versions: +Python 3.8 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33219>
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