[issue8513] subprocess: support bytes program name (POSIX)

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

I think your partA patch makes sense.

It would benefit from fsencode/fsdecode functions rather than manually doing the 'surrogateescape' thing everywhere.

Also, could you add a unittest for os._execvpe to test its behavior?

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