float("nan") in set or as key

[Erik Max Francis]

Albert Hopkins wrote:
> On Sun, 2011-05-29 at 00:41 +0100, MRAB wrote:
>>>> 1.0 == 1.0
> True
>>>> float("nan") == float("nan")
> False
> 
> I can't cite this in a spec, but it makes sense (to me) that two things
> which are nan are not necessarily the same nan.

It's part of the IEEE standard.

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