docs: @Override
      public boolean applyCardinality( String inputKey, Object input, WalkedPath walkedPath, Object parentContainer ) {
  
          MatchedElement thisLevel = getMatch( inputKey, walkedPath );
          if ( thisLevel == null ) {
              return false;
          }
          performCardinalityAdjustment( inputKey, input, walkedPath, (Map) parentContainer, thisLevel );
          return true;
      }