Email.php

<?php

namespace Drupal\Core\TypedData\Plugin\DataType;

use Drupal\Core\Serialization\Attribute\JsonSchema;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\TypedData\Attribute\DataType;
use Drupal\Core\TypedData\Type\StringInterface;

/**
 * The Email data type.
 *
 * The plain value of Email is the email address represented as PHP string.
 */
class Email extends StringData implements StringInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getCastedValue() {
        return parent::getCastedValue();
    }

}