Redis Cache Adapter always uses tcp scheme even if unix socket connection string used

line 123

$params['scheme'] = isset($params['host']) ? 'tcp' : 'unix';

line 93

$params += array(
            'host' => isset($params['host']) ? $params['host'] : $params['path'],

so $params['host'] is never empty => scheme is always tcp even if path is unix socket, which leads to exception in Predis Client.

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