docs: public void setInto(ReadWritablePeriod writablePeriod, Object object, Chronology chrono) {
          ReadableInterval interval = (ReadableInterval) object;
          chrono = (chrono != null ? chrono : DateTimeUtils.getIntervalChronology(interval));
          long start = interval.getStartMillis();
          long end = interval.getEndMillis();
          int[] values = chrono.get(writablePeriod, start, end);
          for (int i = 0; i < values.length; i++) {
              writablePeriod.setValue(i, values[i]);
          }
      }