code: func (h *Histogram) Min() int64 {
  	var min int64
  	i := h.iterator()
  	for i.next() {
  		if i.countAtIdx != 0 && min == 0 {
  			min = i.highestEquivalentValue
  			break
  		}
  	}
  	return h.lowestEquivalentValue(min)
  }
docs: // Min returns the approximate minimum recorded value.