STINNER Victor <victor.stin...@haypocalc.com> added the comment:

I have different questions:
 - Should we trust PyObject_IsInstance() or PyUnicode_Check() (because they 
give different results)?
 - Should PyObject_IsInstance() and PyUnicode_Check() give the same result?
 - Should we fix the segfault?

To fix the segfault, I suppose that we use a more strict validation on the 
input type. Eg. Use PyUnicode_Check() instead of PyObject_IsInstance()?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9756>
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