_wind_combining_class
_wind_combining_class(a[j]) < _wind_combining_class(a[j-1]);
int cc = _wind_combining_class(tmp[i]);
j < tmp_len && _wind_combining_class(tmp[j]);
while (i < in_len && _wind_combining_class(in[i]) != 0) {
cc = _wind_combining_class(in[i]);
int _wind_combining_class(uint32_t);