BooleanData.php

<?php

namespace Drupal\Core\TypedData\Plugin\DataType;

use Drupal\Core\TypedData\PrimitiveBase;
use Drupal\Core\TypedData\Type\BooleanInterface;

/**
 * The boolean data type.
 *
 * The plain value of a boolean is a regular PHP boolean. For setting the value
 * any PHP variable that casts to a boolean may be passed.
 *
 * @DataType(
 *   id = "boolean",
 *   label = @Translation("Boolean")
 * )
 */
class BooleanData extends PrimitiveBase implements BooleanInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getCastedValue() {
        return (bool) $this->value;
    }

}