docs: protected void nullReference( List<Comparison> comparisons,
                                    Comparison comparisonToNull ) {
          if (comparisonToNull != null) {
              for (int i = 0; i != comparisons.size(); ++i) {
                  if (comparisons.get(i) == comparisonToNull) comparisons.set(i, null);
              }
          }
      }