function isPadded(origA, origB) {
  if (hasZeros(origA) || hasZeros(origB)) {
    var alen = length(origA);
    var blen = length(origB);
    var len = alen >= blen ? alen : blen;
    return function (a) {
      return repeatStr('0', len - length(a));
    };
  }

  return false;
}
If the string is padded, returns a curried function with
the a cached padding string, or `false` if no padding.

@param  {*} `origA` String or number.
@return {String|Boolean}