code: function($super, key, value, properties) {
              $super(key, value, properties);
  
              switch(key) {
  
                  case 'chart.columnSpacing':
                      this.mapColumnSpacing(value);
                      break;
                  case 'chart.seriesSpacing':
                      this.mapSeriesSpacing(value);
                      break;
                  default:
                      // no-op, ignore unsupported properties
                      break;
              }
          }
docs: override