[issue33217] x in enum.Flag member is True when x is not a Flag

[Ethan Furman]

Ethan Furman <ethan at stoneleaf.us> added the comment:

DeprecationWarning is in 3.7, now need to raise TypeError in 3.8.

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stage: patch review -> needs patch
versions:  -Python 3.6

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<https://bugs.python.org/issue33217>
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