code: func (lb *lastBundle) Compare(e common.Comparator) int {
  	keyed := e.(keyed)
  	if lb.id == keyed.key() {
  		return 0
  	}
  
  	if lb.id > keyed.key() {
  		return 1
  	}
  
  	return -1
  }
docs: // Compare returns a value indicating the relative relationship and the
  // provided bundle.