gcc is optimizing the second if check , for specifically i == 0 seems to
redundant according to gcc.

        if (i == 0 && quote_empty) {
                if (dialect->quoting == QUOTE_NONE) {
                        PyErr_Format(error_obj,
                                     "single empty field record must be
quoted");
                        return -1;
                }
                else
                        *quoted = 1;
        }