[docs] [issue11945] Adopt and document consistent semantics for handling NaN values in containers

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

After further discussion on python-dev, it is clear that this identity checking behaviour handles more than just NaNs - it also allows containers to cope more gracefully with objects like NumPy arrays that make use of rich comparisons to return something other than simple True/False values for equality checks.

Also, since I neglected to mention it in the initial post, merely *adding* the glossary entry is just the first step. It then needs to be referenced from the appropriate points in the language and library reference.

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<http://bugs.python.org/issue11945>
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