code: func (s Int32) List() []int32 {
  	res := make(sortableSliceOfInt32, 0, len(s))
  	for key := range s {
  		res = append(res, key)
  	}
  	sort.Sort(res)
  	return []int32(res)
  }
docs: // List returns the contents as a sorted int32 slice.