potion_str_slice_index  224 core/string.c    size_t startoffset = potion_utf8char_offset(str, PN_INT(potion_str_slice_index(start, len, 0)));
potion_str_slice_index  227 core/string.c      endoffset = potion_utf8char_offset(str, PN_INT(potion_str_slice_index(start+end, len, len)));
potion_str_slice_index  229 core/string.c      endoffset = potion_utf8char_offset(str, PN_INT(potion_str_slice_index(end, len, len)));