/**
* Remove the unit of a length
*
* @param {Number} $number - Number to remove unit from
* @return {Number} - Unitless number
*/
@function strip-unit($number) {
	@if type-of($number) == "number" and not unitless($number) {
		@return $number / ($number * 0 + 1);
	}

	@return $number;
}