/**
* MxRecord constructor.
*
* @param Node $node
* @param int $ttl
* @param int $preference
* @param string $exchange
*/
public function __construct(Node $node, $ttl, int $preference, string $exchange)
{
$this->preference = $preference;
$this->exchange = $exchange;
parent::__construct($node, eRecordType::MX(), $ttl);
}
