code: func (s *ExpDecaySample) Values() []int64 {
  	s.mutex.Lock()
  	defer s.mutex.Unlock()
  	vals := s.values.Values()
  	values := make([]int64, len(vals))
  	for i, v := range vals {
  		values[i] = v.v
  	}
  	return values
  }
docs: // Values returns a copy of the values in the sample.