anchor.diff:  
     bool _mounted = true;
   
  -  /// Wether [dispose] was called or not.
  +  /// Whether [dispose] was called or not.
     bool get mounted => _mounted;
   
     bool _debugCanAddListeners = true;
  
positive.code: /// If you want to obtain the current [state] from outside of [StateNotifier],
  /// consider using [addListener] instead.
  ///
  /// All listeners added with [addListener] are called **immediatly** on addition
  /// with the current [state] as parameter, or whenever [state] changes.
  ///
  /// # The differences with `ValueNotifier`
  
negative.code: /// your custom [StateNotifier.state].
  typedef ErrorListener = void Function(dynamic error, StackTrace stackTrace);
  
  /// A function that allows obtaining other objects.
  ///
  /// This is usually equivalent to `Provider.of`, but with no dependency on Flutter
  ///
  