[issue1640] Enhancements for mathmodule

[Christian Heimes]

Christian Heimes added the comment:

The mail interface screwed up the message:

>>> math.atanh(.9999999999999999)
18.714973875118524
>>> math.atanh(.99999999999999999)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: math domain error

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue1640>
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