if (provider instanceof ChangingValue) {
            Cast.<ChangingValue<Iterable<T>>>uncheckedNonnullCast(provider).onValueChange(previousValues -> clearCachedElement(element));
        }
        return element;
    }

    private void doAddRealized(T value) {
        if (addRealized(value) && pendingAddedAction != null) {

            collector.collectInto(builder);
            List<T> realized = builder.build();
            for (T element : realized) {
                doAddRealized(element);
            }
        }
    }

    private void doAddRealized(T value) {
        if (values.add(value) && addRealizedAction != null) {
            addRealizedAction.execute(value);
        }
    }

    @Override