Raymond Hettinger added the comment:
I think this should be closed. AFAICT it is of interest to a very tiny subset
of the human species and as near as I can tell that subset doesn't include
people in the numeric and statistics community (the ones who actually use NaNs
as placeholders for missing values).
So much code (and human reasoning) assumes that identity-implies-equality, that
is would be easier to document the exception to expectation than to try to find
every place in every module where the assumption is present (implicitly or
explicitly). Instead, it would be better to document that distinct
float('NaN') objects are never equal to one another and that identical
float('NaN') objects may or may not compare equal in various implementation
dependent circumstances.
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<http://bugs.python.org/issue11945>
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