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It's difficult to use unicode_encode_call_errorhandler() because the caller has to:
 - resize the output buffer (and check for integer overflow on the new size)
 - handle bytes and str for the replacement string: PyUnicode_EncodeDecimal() doesn't support bytes for example
 - encode replacement str: some encoders uses ASCII, unicode_encode_ucs1() uses Latin1, PyUnicode_EncodeCharmap() uses a recursive call (without check for infinite loop!), ... ; and raise a UnicodeEncodeError if the encoding fails
It would be nice to factorize this code.
I plan this implement this refactoring, it's just a reminder for me :-)