code: func Round(v float32, prec int) float32 {
  	p := float32(prec)
  	t := v * math32.Pow(10, p)
  	if t > 0 {
  		return math32.Floor(t+0.5) / math32.Pow(10, p)
  	}
  	return math32.Ceil(t-0.5) / math32.Pow(10, p)
  }
docs: // Round shortens a float32 value to a specified precision (number of digits
  // after the decimal point) with "round half up" tie-breaking rule. Half-way
  // values (23.5) are always rounded up (24).