def _rewind_decoded_chars(self, n):
        """Rewind the _decoded_chars buffer."""
        if self._decoded_chars_used < n:
            raise AssertionError("rewind decoded_chars out of bounds")
        self._decoded_chars_used -= n
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/_jyio.py/TextIOWrapper._rewind_decoded_chars/original