[issue7561] Filename-taking functions in posix segfault when called with a bytearray arg.

[Stefan Krah]

Stefan Krah <stefan-usenet at bytereef.org> added the comment:

Sorry that I missed the first part of your patch. I don't know exactly
what PyByteArray_AS_STRING() is meant to do either, but I think it would
make sense to return an empty string. This here works:

>>> bytes(bytearray(b''))
b''

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<http://bugs.python.org/issue7561>
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