Fixed bug for PHP 8

[Victor-Truhanovich]

Attempted to call an undefined method named "isBuiltin" of class "ReflectionUnionType".

[xabbuh]

Can you please add a test case that would fail without this change?

[Victor-Truhanovich]

/**
 * @Rest\Route("accounts")
 */
class AccountController extends AbstractFOSRestController implements ApiControllerInterface
{
    /**
     * @Rest\Get("/{id}", requirements={"id"="\d+"})
     *
     * @param Account|EntityInterface $account
     *
     * @return View
     */
    public function read(Account|EntityInterface $account): View
    {
        return $this->accountResponseManager->create($account);
    }
}

[Victor-Truhanovich]

Can you please add a test case that would fail without this change?

Sorry, I added tests for my code, but I never got an answer from you

[xabbuh]

Thank you @Viktor-Truhanovich.