- Made AssistedBuilder behave more explicitly: it can build either innstance of a concrete class (``AssistedBuilder(cls=Class)``) or it will follow Injector bindings (if exist) and construct instance of a class pointed by an interface (``AssistedBuilder(interface=Interface)``). ``AssistedBuilder(X)`` behaviour remains the same, it's equivalent to ``AssistedBuilder(interface=X)``