[issue14521] math.copysign(1., float('nan')) returns -1.

[Mark Dickinson]

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

Here's an example based on the dtoa.c code.  It only changes the return value of float('nan'), and doesn't affect any other existing uses of the Py_NAN macro.  It needs tests.

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keywords: +patch
Added file: http://bugs.python.org/file25163/issue14521.patch

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