[issue13889] str(float) and round(float) issues with FPU precision

[Mark Dickinson]

Changes by Mark Dickinson <dickinsm at gmail.com>:


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type:  -> behavior
versions: +Python 3.2, Python 3.3 -Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13889>
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