Declare strict types

Author: nikolaevas

lib/internal/Magento/Framework/DataObject/IdentityValidator.php

@@ -3,6 +3,8 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\DataObject;
 
 use Ramsey\Uuid\Uuid;
@@ -15,7 +17,7 @@ class IdentityValidator implements IdentityValidatorInterface
     /**
      * @inheritDoc
      */
-    public function isValid($value)
+    public function isValid(string $value): bool
     {
         $isValid = Uuid::isValid($value);
         return $isValid;

lib/internal/Magento/Framework/DataObject/IdentityValidatorInterface.php

@@ -15,7 +15,7 @@ interface IdentityValidatorInterface
      *
      * @param string $value
      *
-     * @return string
+     * @return bool
      */
-    public function isValid($value);
+    public function isValid(string $value): bool;
 }