anchor.diff:     * returned.
      */
     List<JsObject> getHelpers(Position pos, String type) {
  -    return new List<JsObject>.from(
  -        callArgs('getHelpers', [pos.toProxy(), type]));
  +    return new List.from(callArgs('getHelpers', [pos.toProxy(), type]));
     }
   
     /**
  
positive.code:   String get mode => jsProxy['mode'];
  
    /// The mode's file extension.
    List<String> get ext => new List<String>.from(jsProxy['ext']);
  
    /// The mode's other file extensions.
    List<String> get alias =>
  
negative.code:   List<TextMarker> getAllMarks() {
      var result = call('getAllMarks');
      if (result is! List) return [];
      return new List.from(result.map((mark) => new TextMarker(mark)));
    }
  
    /**
  