anchor.diff:    @override
     JsObject call(Map props, [dynamic children]) {
       convertProps(props);
  -    
  +
       // Convert Iterable children to JsArrays so that the JS can read them.
       // Use JsArrays instead of Lists, because automatic List conversion results in
       // react-id values being cluttered with ".$o:0:0:$_jsObject:" in dart2js-transpiled Dart.
  
positive.code: typedef Component ComponentFactory();
  
  /**
   * A Dart function that creates React JS component instances.
   */
  abstract class ReactComponentFactoryProxy implements Function {
  
negative.code:     }
  
      if (extendedProps.containsKey('ref')) {
        var ref = extendedProps['ref'];
  
        // If the ref is a callback, pass React a function that will call it
        // with the Dart component instance, not the JsObject instance.
        if (ref is _CallbackRef) {
          jsProps['ref'] = (JsObject instance) => ref(_getComponent(instance));
        } else {
          jsProps['ref'] = ref;
        }
      }
  
      /**
  