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under big endian. 2. ":set octal" with nonprintable character causes nbwcurses move error. 3. moving (big)words by wW/eE/bB can't handle non-ascii characters. 4. toggle uppercase/lowercase by ~ can't handle non-ascii characters. 5. don't feed CHAR_T(=wchar_t) to is* function directly. is* funcs with over UCHAR_MAX value may cause undefined behavior. some ctype implementation(such as FreeBSD) return unexpected result(same result as isw* func). 6. using non-ascii digit character with count/line number of ex/vi command may causes unexpeced result.