anchor.diff:        if (_state == state) return;
   
         // update the internal state and publish the change
  +      _stateController.add(new StoreChange(state, _state, action));
         _state = state;
  -      _stateController.add(_state);
       };
   
       // if middleware is give build the chain
  
positive.code: import 'middleware.dart';
  import 'typedefs.dart';
  
  /// [Store] is the container of your state.
  class Store<State extends BuiltReducer<State, StateBuilder>,
      StateBuilder extends Builder<State, StateBuilder>, Actions extends ReduxActions> {
    // stream used for dispatching actions
    final StreamController<Action<dynamic>> _dispatch = new StreamController.broadcast();
  
    // stream used to dispatch changes to the state
    final StreamController<State> _stateController = new StreamController.broadcast();
  
    // the current state
    State _state;
  
negative.code:   }
  
    /// [subscribe] returns a stream that will be dispatched whenever the state changes
    Stream<StoreChange<State, StateBuilder, dynamic>> get subscribe => _stateController.stream;
  
    /// [state] returns the current state
    State get state => _state;
  