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

[Zackery Spytz]

Change by Zackery Spytz <zspytz at gmail.com>:


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pull_requests: +20893
pull_request: https://github.com/python/cpython/pull/21749

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