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

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


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assignee: docs at python -> rhettinger
nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11945>
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