code: func (e Env) Sorted() []string {
  	var r []string
  	if len(e.env) > 0 {
  		r = make([]string, 0, len(e.env))
  		for _, v := range e.env {
  			r = append(r, v)
  		}
  		sort.Strings(r)
  	}
  	return r
  }
docs: // Sorted returns the contents of the environment, sorted by key.