docs: function parseNum (string) {
  	let unit;
  	const num = parseFloat(string.replace(/(\D+)$/, (s) => {
  		unit = s;
  		return "";
  	}));
  	if (!isNaN(num)) {
  		return {
  			num: num,
  			unit: unit || "",
  		};
  	}
  }