private final Instantiator instantiator;

    public DefaultRealizableTaskCollection(Class<T> type, TaskCollection<T> delegate, MutableModelNode modelNode, Instantiator instantiator) {
        super(delegate);
        assert !(delegate instanceof DefaultRealizableTaskCollection) : "Attempt to wrap already realizable task collection in realizable wrapper: " + delegate;

        this.type = type;

    }

    @Override
    public <S extends Task> TaskCollection<S> withType(Class<S> type) {
        Instantiator instantiator = getInstantiator();
        return Cast.uncheckedCast(instantiator.newInstance(DefaultRealizableTaskCollection.class, type, super.withType(type), modelNode, instantiator));
    }

    @Deprecated
    @Override
    public boolean remove(Object o) {
        throw unsupportedTaskRemovalException();
    }