docs: public int[] addWrapField(ReadablePartial instant, int fieldIndex, int[] values, int valueToAdd) {
          int current = values[fieldIndex];
          int wrapped = FieldUtils.getWrappedValue
              (current, valueToAdd, getMinimumValue(instant), getMaximumValue(instant));
          return set(instant, fieldIndex, values, wrapped);  // adjusts smaller fields
      }