Redis Adapter checks majorversion with version_compare but RedisResourceManager returns integer

[boesing]

The RedisResourceManager always returns integer as version information. Therefore, the check in Redis Adapter wont work as expected.

    /**
     * Get redis server version
     *
     * @param string $id
     * @return int
     * @throws Exception\RuntimeException
     */
    public function getMajorVersion($id)
    {
        // check resource id and initialize the resource
        $this->getResource($id);

        return (int) $this->resources[$id]['version'];
    }

            $redisVersion = $this->resourceManager->getMajorVersion($this->resourceId);

            // redis >= 2.8
            // The command 'pttl' returns -2 if the item does not exist
            // and -1 if the item has no associated expire
            if (version_compare($redisVersion, '2.8',  '>=')) {
                $pttl = $redis->pttl($this->namespacePrefix . $normalizedKey);
                if ($pttl <= -2) {
                    return false;
                }
                $metadata['ttl'] = ($pttl == -1) ? null : $pttl / 1000;

            // redis >= 2.6
            // The command 'pttl' returns -1 if the item does not exist or the item as no associated expire
            } elseif (version_compare($redisVersion, '2.6', '>=')) {
                $pttl = $redis->pttl($this->namespacePrefix . $normalizedKey);
                if ($pttl <= -1) {
                    if (!$this->internalHasItem($normalizedKey)) {
                        return false;
                    }
                    $metadata['ttl'] = null;
                } else {
                    $metadata['ttl'] = $pttl / 1000;
                }

            // redis >= 2
            // The command 'pttl' is not supported but 'ttl'
            // The command 'ttl' returns 0 if the item does not exist same as if the item is going to be expired
            // NOTE: In case of ttl=0 we return false because the item is going to be expired in a very near future
            //       and then doesn't exist any more
            } elseif (version_compare($redisVersion, '2', '>=')) {
                $ttl = $redis->ttl($this->namespacePrefix . $normalizedKey);
                if ($ttl <= -1) {
                    if (!$this->internalHasItem($normalizedKey)) {
                        return false;
                    }
                    $metadata['ttl'] = null;
                } else {
                    $metadata['ttl'] = $ttl;
                }

            // redis < 2
            // The commands 'pttl' and 'ttl' are not supported
            // but item existence have to be checked
            } elseif (!$this->internalHasItem($normalizedKey)) {
                return false;
            }