[issue47031] math.nan should note that NANs do not compare equal to anything

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

We cannot guarantee that NAN never equal to anything, because we can create an object equal to it. For example mock.ANY.

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nosy: +serhiy.storchaka

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