[issue4296] Python assumes identity implies equivalence; contradicts NaN

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> Before committing, please add one
> other test that verifies the relationship between "in" in membership
> tests and "in" in a for-loop:

Added.  (To test_contains, since this seems like a more appropriate place 
than test_float.)

Added file: http://bugs.python.org/file11995/issue4296.patch

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