code: func ScaledLabel(value int64, fromUnit, toUnit string) string {
  	v, u := Scale(value, fromUnit, toUnit)
  	sv := strings.TrimSuffix(fmt.Sprintf("%.2f", v), ".00")
  	if sv == "0" || sv == "-0" {
  		return "0"
  	}
  	return sv + u
  }
docs: // ScaledLabel scales the passed-in measurement (if necessary) and
  // returns the label used to describe a float measurement.