code: func (r *record) isExpired() bool {
  	if r.Expires == nil {
  		return false
  	}
  	expiryDateUTC := time.Unix(*r.Expires, 0).UTC()
  	return time.Now().UTC().After(expiryDateUTC)
  }
docs: // isExpired returns 'true' if the given object (record) has a TTL and
  // it's due.