code: func NewSortedSlice(opts ...int) (ss SortedSlice) {
  	l, c := 0, 0
  	if len(opts) >= 1 {
  		l = opts[0]
  	}
  	if len(opts) >= 2 {
  		c = opts[1]
  	}
  	ss.s = make([]Sortable, l, c)
  	return
  }
docs: // NewSortedSlice returns an empty initialized slice. Opts takes len and cap in
  // order to initialize the underlying slice