* @since 1.1
	 *
	 * @param bool|int $multiple The provided $multiple value.
	 * @return array
	 */
	public static function get_multiple_and_max( $multiple ) {

		$max_selection_number = 999;

		if ( is_numeric( $multiple ) ) {
			$multiple = (int) $multiple;

			/**
			 * Treat -1 as unlimited just like in WordPress's get_posts (well, in this Kirki case, it's 999 :).
			 * Also treat 0 as "unlimited" because 1 it self will disable the multiple selection.
			 */
			if ( 0 >= $multiple ) {
				$max_selection_number = 999;
				$multiple             = true;
			} else {
				// If $multiple is > 1.
				if ( 1 < $multiple ) {
					$max_selection_number = $multiple;
					$multiple             = true;
				} else {
					// Here $multiple === 1, that means, it's single mode select.
					$multiple = false;
				}
			}
		}

		return [
			'multiple'             => $multiple,
			'max_selection_number' => $max_selection_number,
		];

	}

}