@Override
        public boolean removePending(ProviderInternal<? extends T> provider) {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean addPendingCollection(CollectionProviderInternal<T, ? extends Iterable<T>> provider) {
            throw new UnsupportedOperationException();
        }

        @Override

                iterator.remove();
                return true;
            }
        }
        return false;
    }

    @Override
    public boolean addPendingCollection(final CollectionProviderInternal<T, ? extends Iterable<T>> provider) {
        if (provider instanceof ChangingValue) {

            defaultListProperty.convention(provider);
            providerInternal = defaultListProperty;
        }
        store.addPendingCollection(providerInternal);
    }

    protected void didAdd(T toAdd) {
    }

    @Override
    public boolean addAll(Collection<? extends T> c) {
        assertMutable("addAll(Collection<T>)");