[issue21873] Tuple comparisons with NaNs are broken

[akira]

akira added the comment:

> Python containers are allowed to let identity-imply-equality (the reflesive property of equality).

Is it documented somewhere?

> Dicts, lists, tuples, deques, sets, and frozensets all work this way. 

Is it CPython specific behaviour?

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