add declare(strict_types=1);

Author: edenduong

app/code/Magento/CatalogSearch/Model/Layer/Filter/Attribute.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\CatalogSearch\Model\Layer\Filter;
 
 use Magento\Catalog\Model\Layer\Filter\AbstractFilter;