ate the controller class once per request.
	 *
	 * @since 6.4.0
	 *
	 * @return WP_REST_Controller|null The controller instance, or null if the post type
	 *                                 is set not to show in rest.
	 */
	public function get_revisions_rest_controller() {
		if ( ! $this->show_in_rest ) {
			return null;
		}

		if ( ! post_type_supports( $this->name, 'revisions' ) ) {
			return null;
		}

		$class = $this->revisions_rest_controller_class ? $this->revisions_rest_controller_class : WP_REST_Revisions_Controller::class;
		if ( ! class_exists( $class ) ) {
			return null;
		}

		if ( ! is_subclass_of( $class, WP_REST_Controller::class ) ) {
			return null;
		}

		if ( ! $this->revisions_rest_controller ) {
			$this->revisions_rest_controller = new $class( $this->name );
		}

		if ( ! ( $this->revisions_rest_controller instanceof $class ) ) {
			return null;
		}

		return $this->revisions_rest_controller;
	}

	/**
	 * Gets the REST API autosave controller for this post type.
	 *
	 * Will only instantiate the controller class once per request.
	 *
	 * @since 6.4.0
	 *
	 * @return WP_REST_Controller|null The controller instance, or null if the post type
	 *                                 is set not to show in rest.
	 */
	public function get_autosave_rest_controller() {
		if ( ! $this->show_in_rest ) {
			return null;
		}

		if ( ! post_type_supports( $this->name, 'autosave' ) ) {
			return null;
		}

		$class = $this->autosave_rest_controller_class ? $this->autosave_rest_controller_class : WP_REST_Autosaves_Controller::class;

		if ( ! class_exists( $class ) ) {
			return null;
		}

		if ( ! is_subclass_of( $class, WP_REST_Controller::class ) ) {
			return null;
		}

		if ( ! $this->autosave_rest_controller ) {
			$this->autosave_rest_controller = new $class( $this->name );
		}

		if ( ! ( $this->autosave_rest_controller instanceof $class ) ) {
			return null;
		}

		return $this->autosave_rest_controller;
	}

	/**
	 * Returns the default labels for post types.
	 *
	 * @since 6.0.0
	 *
	 * @return (string|null)[][] The default labels for post types.
	 */
	public static function get_default_labels() {
		if ( ! empty( self::$default_labels ) ) {
			return self::$default_labels;
		}

		self::$default_labels = array(
			'name'                     => array( _x( 'Posts', 'post type general name' ), _x( 'Pages', 'post type general name' ) ),
			'singular_name'            => array( _x( 'Post', 'post type singular name' ), _x( 'Page', 'post type singular name' ) ),
			'add_new'                  => array( __( 'Add New' ), __( 'Add New' ) ),
			'add_new_item'             => array( __( 'Add New Post' ), __( 'Add New Page' ) ),
			'edit_item'                => array( __( 'Edit Post' ), __( 'Edit Page' ) ),
			'new_item'                 => array( __( 'New Post' ), __( 'New Page' ) ),
			'view_item'                => array( __( 'View Post' ), __( 'View Page' ) ),
			'view_items'               => array( __( 'View Posts' ), __( 'View Pages' ) ),
			'search_items'             => array( __( 'Search Posts' ), __( 'Search Pages' ) ),
			'not_found'                => array( __( 'No posts found.' ), __( 'No pages found.' ) ),
			'not_found_in_trash'       => array( __( 'No posts found in Trash.' ), __( 'No pages found in Trash.' ) ),
			'parent_item_colon'        => array( null, __( 'Parent Page:' ) ),
			'all_items'                => array( __( 'All Posts' ), __( 'All Pages' ) ),
			'archives'                 => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
			'attributes'               => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
			'insert_into_item'         => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
			'uploaded_to_this_item'    => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
			'featured_image'           => array( _x( 'Featured image', 'post' ), _x( 'Featured image', 'page' ) ),
			'set_featured_image'       => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
			'remove_featured_image'    => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
			'use_featured_image'       => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
			'filter_items_list'        => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
			'filter_by_date'           => array( __( 'Filter by date' ), __( 'Filter by date' ) ),
			'items_list_navigation'    => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
			'items_list'               => array( __( 'Posts list' ), __( 'Pages list' ) ),
			'item_published'           => array( __( 'Post published.' ), __( 'Page published.' ) ),
			'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
			'item_reverted_to_draft'   => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
			'item_trashed'             => array( __( 'Post trashed.' ), __( 'Page trashed.' ) ),
			'item_scheduled'           => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
			'item_updated'             => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
			'item_link'                => array(
				_x( 'Post Link', 'navigation link block title' ),
				_x( 'Page Link', 'navigation link block title' ),
			),
			'item_link_description'    => array(
				_x( 'A link to a post.', 'navigation link block description' ),
				_x( 'A link to a page.', 'navigation link block description' ),
			),
		);

		return self::$default_labels;
	}

	/**
	 * Resets the cache for the default labels.
	 *
	 * @since 6.0.0
	 */
	public static function reset_default_labels() {
		self::$default_labels = array();
	}
}