docs: Long poll(int pollerIndex) {
      final long now = clock.now();
      final long step = ServoPollers.POLLING_INTERVALS[pollerIndex];
  
      rollCount(pollerIndex, now);
      final int prevPos = 2 * pollerIndex + PREVIOUS;
      final long value = data[prevPos].get();
  
      final long last = lastPollTime[pollerIndex].getAndSet(now);
      final long missed = (now - last) / step - 1;
  
      if (last / step == now / step) {
        return value;
      } else if (last > 0L && missed > 0L) {
        return null;
      } else {
        return value;
      }
    }