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AddSymfonyConstraintValidatorTypeDeclarationsRector

Add Symfony ConstraintValidatorInterface type declarations (mixed $value / : void) to validator classes.

 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;

 class MyValidator extends ConstraintValidator {
-    public function validate($value, Constraint $constraint) {
+    public function validate(mixed $value, Constraint $constraint): void {
     }
 }