composer create-project symfony/website-skeleton preload "5.1.x-dev"cat preload/var/cache/dev/App_KernelDevDebugContainer.preload.php | grep "bool\|string\|int"

$ cat test/var/cache/dev/App_KernelDevDebugContainer.preload.php | grep "bool\|string\|int"$classes[] = 'int';$classes[] = 'string';$classes[] = 'Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntityValidator';$classes[] = 'Symfony\Component\Security\Http\EntryPoint\RetryAuthenticationEntryPoint';$classes[] = 'Symfony\Component\Security\Core\Validator\Constraints\UserPasswordValidator';$classes[] = 'Symfony\Component\Serializer\Normalizer\ConstraintViolationListNormalizer';$classes[] = 'bool';$classes[] = 'Symfony\Component\Validator\ContainerConstraintValidatorFactory';$classes[] = 'Symfony\Component\Validator\Constraints\EmailValidator';$classes[] = 'Symfony\Component\Validator\Constraints\ExpressionValidator';$classes[] = 'Symfony\Component\Validator\Constraints\NotCompromisedPasswordValidator';$classes[] = 'Symfony\\Component\\Form\\Extension\\Validator\\Constraints\\Form';