docs: public Iterable<StopTime> getOrderedStopTimesForTrip (String trip_id) {
          Map<Fun.Tuple2, StopTime> tripStopTimes =
                  stop_times.subMap(
                          Fun.t2(trip_id, null),
                          Fun.t2(trip_id, Fun.HI)
                  );
          return tripStopTimes.values();
      }