code: func IndexUint(a, b string) bool {
  	ia, _ := strconv.ParseUint(a, 10, 64)
  	ib, _ := strconv.ParseUint(b, 10, 64)
  	return ia < ib
  }
docs: // IndexUint is a helper function that returns true if 'a' is less than 'b'.
  // This compares uint64s that are added to the database using the
  // Uint() conversion function.