New in Symfony 5.1: Misc. improvements (Part 3)

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use Symfony\Component\Serializer\Normalizer\ConstraintViolationListNormalizer;
use Symfony\Component\Validator\Constraints\NotNull;
use Symfony\Component\Validator\ConstraintViolation;
use Symfony\Component\Validator\ConstraintViolationList;

$constraint = new NotNull();
$constraint->payload = ['severity' => 'warning', 'someOtherField' => 'someValue'];
$list = new ConstraintViolationList([
    new ConstraintViolation(/* ... */, $constraint),
]);

$result = $this->normalizer->normalize($list, null, [
    // pass an array of field names to add only those to the payload
    // pass NULL or TRUE to pass all fields
    ConstraintViolationListNormalizer::PAYLOAD_FIELDS => ['severity']]
);
$payload = $result['violations'][0]['payload'];
// $payload = ['severity' => 'warning'];

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// Before
@trigger_error(
    'Not setting the "framework.router.utf8" configuration option is deprecated
    since Symfony 5.1, it will default to "true" in Symfony 6.0.',
    E_USER_DEPRECATED
);

// After
trigger_deprecation(
    'symfony/framework-bundle', '5.1',
    'Not setting the "framework.router.utf8" configuration option is deprecated,
    it will default to "true" in version 6.0.'
);