code: public function rpush($value, ...$values): ?int
      {
          array_unshift($values, $value);
  
          return $this->redis->rpush($this->key, $this->serializeArray($values));
      }
docs: @param mixed $value First value to be inserted.
  @param array<int, mixed> $values,... More values to be inserted.
  
  @return int|null The length of the list after the push operations.