code: func PackJSONBytes(box string, name string, jbb string) error {
  	var bb []byte
  	err := json.Unmarshal([]byte(jbb), &bb)
  	if err != nil {
  		return err
  	}
  	PackBytes(box, name, bb)
  	return nil
  }
docs: // PackJSONBytes packs JSON encoded bytes for a file into a box.