code: func (kz *Kazoo) brokerIDList() ([]int32, error) {
  	brokers, err := kz.Brokers()
  	if err != nil {
  		return nil, err
  	}
  
  	result := make([]int32, 0, len(brokers))
  	for id := range brokers {
  		result = append(result, id)
  	}
  
  	// return sorted list to match the offical kafka sdks
  	sort.Sort(int32Slice(result))
  
  	return result, nil
  }
docs: // BrokerIDList returns a sorted slice of broker ids that can be used for manipulating topics and partitions.`.