Although not technically needed, lets add all the constants.  For variable storage I would not do this, but constants are more treat like environment variables, why I am willing to only duplicate them in this case.  @xillibit Can you add these below also.
	/**
	 * @const  integer
	 * @since  11.3
	 */
	const SCALE_FILL = 1;

	/**
	 * @const  integer
	 * @since  11.3
	 */
	const SCALE_INSIDE = 2;

	/**
	 * @const  integer
	 * @since  11.3
	 */
	const SCALE_OUTSIDE = 3;