anchor.diff:    ///
     /// In minified mode, uses the unminified names if available, otherwise tags
     /// them with 'minified:'.
  -  static String _objectTypeNameNewRti(Object object) {
  +  static String _objectTypeNameNewRti(Object? object) {
       var dartObjectConstructor = JS_BUILTIN(
           'depends:none;effects:none;', JsBuiltin.dartObjectConstructor);
       if (JS('bool', '# instanceof #', object, dartObjectConstructor)) {
  
positive.code:   /// In minified mode, uses the unminified names if available, otherwise tags
    /// them with 'minified:'.
    @pragma('dart2js:noInline')
    static String objectTypeName(Object object) {
      return _objectTypeNameNewRti(object);
    }
  
  
negative.code:       name != null && name != 'Object' && name != '';
  
    /// In minified mode, uses the unminified names if available.
    static String objectToHumanReadableString(Object? object) {
      String name = objectTypeName(object);
      return "Instance of '$name'";
    }
  