public static function init() {
		// Bail early if the Block Playground is active and ahead of core.
		if ( defined( 'PUM_BLOCK_PLAYGROUND' ) && version_compare( PUM_BLOCK_PLAYGROUND, self::$version, '>' ) ) {
			return;
		}

		// TODO Test if this is needed in core or not.
		add_action( 'enqueue_block_editor_assets', [ 'PUM_Site_Assets', 'register_styles' ] );
		add_action( 'enqueue_block_editor_assets', [ __CLASS__, 'register_editor_assets' ] );

		add_action( 'wp_loaded', [ __CLASS__, 'add_attributes_to_registered_blocks' ], 999 );

		// Here for future use.
		// add_action( 'enqueue_block_assets', [ __CLASS__, 'register_block_assets' ] );
	}