BUG: fix powm1 overflow handling #17872
Merged
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Reference issue
No open issue. Supersedes #17855.
What does this implement/fix?
Implements complete error handling as defined in cmath https://en.cppreference.com/w/cpp/numeric/math/pow
Additional information
@WarrenWeckesser the C++ version of your test set with this change applied for validation can be found on this pull: boostorg/math#931. Sorry for the previous braindead PR.