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

Note about _Py_wchar2char(): it is possible to convert character by character 
(instead of working on substrings) because the input string doesn't contain 
surrogate pairs. _Py_char2wchar() ensures the the output string doens't contain 
surrogate pairs: if a byte sequence produces a surrogate pairs, the byte 
sequence is encoded using the surrogateescape error handler (U+DC00..U+DCFF 
range). I should add this note in _Py_wchar2char() comment.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9425>
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