deps/moment-duration-format.js
function padZero(str, len, isRight) {
		if (str == null) { str = ""; }
		str = "" + str;
		
		return (isRight ? str : "") + repeatZero(len - str.length) + (isRight ? "" : str);
	}
function padZero(str, len, isRight) {
		if (str == null) { str = ""; }
		str = "" + str;
		
		return (isRight ? str : "") + repeatZero(len - str.length) + (isRight ? "" : str);
	}
padZero(str, len [, isRight]) pads a string with zeros up to a specified length will not pad a string if its length is aready greater than or equal to the specified length default output pads with zeros on the left set isRight to `true` to pad with zeros on the right