@Override
    public long size() {
        return get(sizeAsync());
    }
@Test
    public void testSize() {
        RBucket<String> bucket = redisson.getBucket("testCompareAndSet");
        assertThat(bucket.size()).isZero();
        bucket.set("1234");
        // json adds quotes
        assertThat(bucket.size()).isEqualTo(5);
    }