[issue3382] Make '%F' and float.__format__('F') convert results to upper case.

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

With the implementation of issue5859 (py3k only), the only case where
this matters in NAN and INF. I'm going to address those in 3.1, and not
make any change for 2.x.

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versions:  -Python 2.7

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