[issue21873] Tuple comparisons with NaNs are broken

[Raymond Hettinger]

Raymond Hettinger added the comment:

Python core containers support the invariant:

    assert all(x in c for x in c)

See also:  http://bertrandmeyer.com/2010/02/06/reflexivity-and-other-pillars-of-civilization/

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assignee:  -> rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21873>
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