docs: static Generator byMonthGenerator(int[] months, final DateValue dtStart) {
          final int[] umonths = Util.uniquify(months);
  
          return new Generator() {
              int i;
              int year = dtStart.year();
  
              @Override
              boolean generate(DTBuilder builder) {
                  if (year != builder.year) {
                      i = 0;
                      year = builder.year;
                  }
                  if (i >= umonths.length) {
                      return false;
                  }
                  builder.month = umonths[i++];
                  return true;
              }
  
              @Override
              public String toString() {
                  return "byMonthGenerator:" + Arrays.toString(umonths);
              }
          };
      }