code: @Override
      public <V> V getMaximum(ChronoElement<V> element) {
  
          V max;
  
          if (this.timestamp.contains(element)) {
              max = this.timestamp.getMaximum(element);
          } else {
              max = this.moment.getMaximum(element);
          }
  
          if (
              (element == SECOND_OF_MINUTE)
              && (this.timestamp.getYear() >= 1972)
          ) {
              PlainTimestamp ts = this.timestamp.with(element, max);
  
              if (!this.zone.isInvalid(ts, ts)) {
                  Moment transformed = ts.in(this.zone);
                  Moment test = transformed.plus(1, SI.SECONDS);
  
                  if (test.isLeapSecond()) {
                      return element.getType().cast(Integer.valueOf(60));
                  }
              }
          }
  
          return max;
  
      }
docs: benutzt in ChronoFormatter/FractionProcessor