public ChangeEventSuppressionToken(ICollection collection, CollectionMirror listener)
            {
                _collection = collection;
                _listener   = listener;

                _listener.Unsubscribe(_collection);
            }
            public ChangeEventSuppressionToken(ICollection collection, CollectionMirror listener)
            {
                _collection = collection;
                _listener = listener;

                _listener.Unsubscribe(_collection);
            }