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I get an exception running test_unicode_file.py - we end up
with a MBCS encoded string passed to
PyUnicode_FromEncodedObject(), that attempts to decode using
the system default encoding rather than the file-system
default.  The error is a NULL pointer deref so should be
obvious - unfortunately the fix requires a local
reimplementation of PyUnicode_FromEncodedObject(), passing
an explicit encoding for string objects.