uint_fast64_t
typedef uint_fast64_t Char;
typedef uint_fast64_t Char;
CHECK_UTYPE(uint_fast64_t, UINT_FAST64);
SNPRINTF_TEST("18446744073709551615", "%wf64u", (uint_fast64_t)ULLONG_MAX);
SWPRINTF_TEST("18446744073709551615", "%wf64u", (uint_fast64_t)ULLONG_MAX);