Martin v. Löwis added the comment:

BTW, did anybody file a bug report with Apple? Even to my untrained eye, that 
looks like a clear violation of the POSIX standard:

If x is ±0, or +Inf, x shall be returned.
http://pubs.opengroup.org/onlinepubs/009604599/functions/log1p.html

C seems to make it implementation-defined, unless the implementation defines 
__STDC_IEC_559__, in which case log1p also needs to return ±0 (C99  F.9.3.9, 
C11 F.10.3.9).

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<http://bugs.python.org/issue15477>
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