mp_eq_to_hgt
if (end_list && mp_eq_to_hgt(mp, end_list, h)) {
if (mp_eq_to_hgt(mp, start_list, height)) {
if (end_list && mp_eq_to_hgt(mp, end_list, height)) {
if (!mp_eq_to_hgt(mp, end_list, height))