code: func (l *rateLimiterImpl) Stop() {
  	l.mutex.Lock()
  	defer l.mutex.Unlock()
  
  	if l.stopped {
  		return
  	}
  
  	l.stopped = true
  
  	close(l.stopChan)
  	l.ticker.Stop()
  
  	l.cond.Broadcast()
  }
docs: // Stop the rate limiter.