public function serializeInt(int $number = null)
    {
        if (null === $number) {
            return $this->serializeInt(self::NULL_SENTINEL);
        }
        else {
            $uint8 = [
                $number         & 0xff,
                ($number >> 8)  & 0xff,
                ($number >> 16) & 0xff,
                ($number >> 24) & 0xff
            ];
        }

        return $uint8;
    }