code: public static <K, V> Flux<ScoredValue<V>> zscan(RedisSortedSetReactiveCommands<K, V> commands, K key, ScanArgs scanArgs) {
  
          LettuceAssert.notNull(scanArgs, "ScanArgs must not be null");
  
          return zscan(commands, key, Optional.of(scanArgs));
      }
docs: Sequentially iterate over elements in a set identified by {@code key}. This method uses {@code SSCAN} to perform an
  iterative scan.
  
  @param commands the commands interface, must not be {@literal null}.
  @param key the sorted set to scan.
  @param scanArgs the scan arguments, must not be {@literal null}.
  @param <K> Key type.
  @param <V> Value type.
  @return a new {@link Flux}.