private function addMultiExecIncrement(MultiExec $multi, $subject, $bucket)
    {
        // Increment the current bucket
        $multi->hincrby($subject, $bucket, 1);
        // Clear the buckets ahead
        $multi->hdel($subject, ($bucket + 1) % $this->bucketCount)->hdel($subject, ($bucket + 2) % $this->bucketCount);
        // Renew the key TTL
        $multi->expire($subject, $this->subjectExpiry);
    }