code: func (a LinkAddress) String() string {
  	switch len(a) {
  	case 6:
  		return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", a[0], a[1], a[2], a[3], a[4], a[5])
  	default:
  		return fmt.Sprintf("%x", []byte(a))
  	}
  }
docs: // String implements the fmt.Stringer interface.