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Working in an internationalization proposal <http://python.org.ar/pyar/TracebackInternationalizationProposal>
I've stopped at #9769 where multi byte encodings (like utf-8) is not supported by PyUnicode_FromFormatV()
Beside my proposal, I think utf-8 should be supported for consistency with the other unicode functions, like PyUnicode_FromString() or even unicode_fromformat_arg()
Attached is a patch that:
- enhanced the iterator to detect multibyte sequences, with sanity checks about start & continuation bytes
- replaced unicode_write_cstr with PyUnicode_DecodeUTF8Stateful
- tests
Hope it helps, this is my first patch for cpython and my C skills are a bit rusty, so excuse me if there is any newbie glitch