public Flowable<V> iterator() {
        return scanIteratorReactive(null, 10);
    }
@Test
    public void testIteratorNextNext() {
        RScoredSortedSetRx<String> set = redisson.getScoredSortedSet("simple");
        sync(set.add(1, "1"));
        sync(set.add(2, "4"));

        Iterator<String> iter = toIterator(set.iterator());
        Assertions.assertEquals("1", iter.next());
        Assertions.assertEquals("4", iter.next());
        Assertions.assertFalse(iter.hasNext());
    }