/**
* @param string $key
* @param mixed $value
* @param string|bool $group
* @param int $expiration
* @return mixed
*/
public function set($key, $value, $expiration = null, $group = null)
{
return $this->adapter->set($this->key($key, $group), $value, $expiration, $this->key($group, true));
}
