[issue39871] math.copysign raises SystemError with non-float x and custom y

[Mark Dickinson]

Change by Mark Dickinson <dickinsm at gmail.com>:


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pull_requests: +18337
pull_request: https://github.com/python/cpython/pull/18990

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39871>
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