[issue1381] cmath is numerically unsound

[Mark Dickinson]

Mark Dickinson added the comment:

Here's an updated patch for cmath, complete with tests and documentation changes.
There's an extra file, Lib/test/cmath.ctest, containing test values for the various functions;  
these test values were obtained using MPFR and interval arithmetic, and (modulo bugs) should 
all be correctly rounded.

Any feedback would be much appreciated.

Added file: http://bugs.python.org/file9065/cmath3.patch

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