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Thu Mar 25 13:39:25 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-March/098881.html

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On 03/25/2010 12:22 PM, Nick Coghlan wrote:
>   "Not a Number" is not a single floating point value. Instead each
>   instance is a distinct value representing the precise conditions that
>   created it. Thus, two "NaN" values x and y will compare equal iff they
>   are the exact same NaN object (i.e. "if isnan(x) then x == y iff
>   x is y".
> 
> As stated above, such a change would allow us to restore reflexivity
> (eliminating a bunch of weirdness) while still honouring the idea of NaN
> being a set of values rather than a single value.

Sounds good.

But IEEE 754 was created by pretty clever guys and sure they had a
reason for define things in the way they are. Probably we are missing
something.

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[Python-Dev] Why is nan != nan?