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

I would be possible to implement incremental decoder with mbsrtowcs() and 
incremental encoder with wcsrtombs(), by serializing mbstate_t to a long 
integer (TextIOWrapper.tell() does something like that). The problem is that 
mbsrtowcs() and wcsrtombs() are "recent" (not always available). It may also be 
dangerous to allow the user to pass an arbitrary mbstate_t (using .setstate()).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13619>
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