// src/Entity/Author.php
        namespace App\Entity;

        use Symfony\Component\Validator\Constraints as Assert; # False positive here

        use Symfony\Component\Validator\Mapping\ClassMetadata;

        class Author
        {
            // ...

            public static function loadValidatorMetadata(ClassMetadata $metadata): void
            {
                $metadata->addPropertyConstraint('mac', new Assert\MacAddress());
            }
        }