code: func IndexFloat(a, b string) bool {
  	ia, _ := strconv.ParseFloat(a, 64)
  	ib, _ := strconv.ParseFloat(b, 64)
  	return ia < ib
  }
docs: // IndexFloat is a helper function that returns true if 'a' is less than 'b'.
  // This compares float64s that are added to the database using the
  // Float() conversion function.