docs: public Object applyToParentContainer ( String inputKey, Object input, WalkedPath walkedPath, Object parentContainer ) {
  
          MatchedElement thisLevel = getMatch( inputKey, walkedPath );
          if ( thisLevel == null ) {
              return null;
          }
          return performCardinalityAdjustment( inputKey, input, walkedPath, (Map) parentContainer, thisLevel );
      }