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Sun Jul 13 22:05:27 CEST 2014 · https://mail.python.org/pipermail/python-dev/2014-July/135483.html

Nick Coghlan <ncoghlan at gmail.com> writes:
...
> definition of floats and the definition of container invariants like
> "assert x in [x]")
>
> The current approach means that the lack of reflexivity of NaN's stays
> confined to floats and similar types - it doesn't leak out and infect
> the behaviour of the container types.
>
> What we've never figured out is a good place to *document* it. I
> thought there was an open bug for that, but I can't find it right now.

There was related issue "Tuple comparisons with NaNs are broken"
http://bugs.python.org/issue21873 
but it was closed as "not a bug" despite the corresponding behavior is
*not documented* anywhere.

--
Akira

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[Python-Dev] == on object tests identity in 3.x