in worker.go [84:94]
func (o *output) median() time.Duration {
if o.med == 0 {
// Sort durations and pick the middle one.
sort.Slice(o.durations, func(i, j int) bool {
return o.durations[i] < o.durations[j]
})
o.med = o.durations[len(o.durations)/2]
}
return o.med
}