[issue40527] Multiple "unknown option" errors when passing unknown arguments to the interpreter

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> I was able to bisect this to the following commit: (...)

Oh, well done! Yeah, it's all my fault ;-) It's a regression of the PEP 587 (PyConfig) implementation.

I chose to share code between Python/preconfig.c and Python/initconfig.c rather than duplicate code. The implementation of _PyPreConfig_Read() and PyConfig_Read() is quite complex.

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<https://bugs.python.org/issue40527>
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