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: 
    static Map<JsObject, CodeMirror> _instances = {};
  
    static List<String> get MODES => new List<String>.from(
        keys(_cm['modes']).where((modeName) => modeName != 'null'));
  
    static List<String> get MIME_MODES =>
        new List<String>.from(keys(_cm['mimeModes']));
  
    static List<String> get COMMANDS =>
        new List<String>.from(keys(_cm['commands']));
  
    /**
     * It contains a string that indicates the version of the library. This is a
  
negative.code:   List<TextMarker> getAllMarks() {
      var result = call('getAllMarks');
      if (result is! List) return [];
      return new List.from(result.map((mark) => new TextMarker(mark)));
    }
  
    /**
  