code: func (q *TransmitLimitedQueue) addItem(cur *limitedBroadcast) {
  	_ = q.tq.ReplaceOrInsert(cur)
  	if cur.name != "" {
  		q.tm[cur.name] = cur
  	}
  }
docs: // addItem adds the given item into the overall datastructure. You must already
  // hold the mutex.