code: func (k Key) OneLine() string {
  	if len(k.Fingerprint) < 24 {
  		return fmt.Sprintf("(invalid:%s)", k.Fingerprint)
  	}
  	return fmt.Sprintf("0x%s - %s", k.Fingerprint[24:], k.Identity().ID())
  }
docs: // OneLine prints a terse representation of this key on one line (includes only
  // the first identity!)