[issue10925] Document pure Python version of integer-to-float correctly-rounded conversion

[Mark Dickinson]

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

Thanks for the comments.  Here's an updated patch, that actually makes use of the pure Python version to test the built-in int-to-float conversion.

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versions:  -Python 2.7, Python 3.2
Added file: http://bugs.python.org/file23495/pure_python_long_to_float_v2.patch

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