[issue18264] enum.IntEnum is not compatible with JSON serialisation

[Eli Bendersky]

Eli Bendersky added the comment:

LGTM now. Make sure to run the test(s) in refleak mode and let's wait for a couple of days before committing, in case someone else has comments.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18264>
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