anchor.diff:  external reduceRightSumDoubledElements(List array);
   
   @Js()
  -external getOwnPropertyDescriptorJson(List array, property);
  +external PropertyDescriptor getOwnPropertyDescriptor(obj, property);
   
   @Js("setLength")
   external callSetLength(List array, length);
  
positive.code:       expect(listView.length, equals(2));
        expect(checkIsArray(listView), isFalse);
        expect(checkIsArray(listView.toList()), isTrue);
        expect(getOwnPropertyDescriptorJson(
            listView, "length"), equals("null"));
      });
    });
    */
  
negative.code: 
  };
  """);
  }
  
  @Js()
  class PropertyDescriptor {
    external get value;
    external bool get writable;
    external bool get enumerable;
    external bool get configurable;
  }
  
  @Js()
  