code: func NewCount(it graph.Iterator, qs graph.QuadStore) *Count {
  	return &Count{
  		uid: NextUID(),
  		it:  it, qs: qs,
  	}
  }
docs: // NewCount creates a new iterator to count a number of results from a provided subiterator.
  // qs may be nil - it's used to check if count Contains (is) a given value.