gh-121889: cmath.acosh(0+nanj) returns nan+pi/2j #121892
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As per C11 DR#471 (adjusted resolution accepted for C17), cacosh (0 + iNaN) should return NaN ± i pi/2, not NaN + iNaN. This patch fixes cmath's code to do same.
mdickinson
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Thanks for the PR. This LGTM.
I don't think this should be backported - it's not behaviour that I'd want to change in a bugfix release. It's enough that CPython will eventually (Python >= 3.14) do the right thing.
brandtbucher
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As per C11 DR#471 (adjusted resolution accepted for C17), cacosh (0 + iNaN) should return NaN ± i pi/2, not NaN + iNaN. This patch fixes cmath's code to do same.
blhsing
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As per C11 DR#471 (adjusted resolution accepted for C17), cacosh (0 + iNaN) should return NaN ± i pi/2, not NaN + iNaN. This patch fixes cmath's code to do same.
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As per C11 DR#471 (adjusted resolution accepted for C17), cacosh (0 + iNaN) should return NaN ± i pi/2, not NaN + iNaN. This patch fixes cmath's code to do same.
glibc patch: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=5244527da1bfa751492e146d3e6ae128c59bfcc4