docs: public int[] get(ReadablePeriod period, long startInstant, long endInstant) {
          int size = period.size();
          int[] values = new int[size];
          if (startInstant != endInstant) {
              for (int i = 0; i < size; i++) {
                  DurationField field = period.getFieldType(i).getField(this);
                  int value = field.getDifference(endInstant, startInstant);
                  if (value != 0) {
                      startInstant = field.add(startInstant, value);
                  }
                  values[i] = value;
              }
          }
          return values;
      }