title: How to use kFSEventStreamEventFlagEventIdsWrapped with FSEvents?
body: <p>I'm trying to understand how to use the <code>kFSEventStreamEventFlagEventIdsWrapped</code> event flag with <code>FSEvents</code>.</p>
  
  <p>According to the documentation, the flag is sent to registered instances when the event id counter wraps around, thus rendering previous event id obsolete.</p>
  
  <p>Now let's imagine the following scenario:</p>
  
  <ul>
  <li>I register for <code>FSEvents</code> in my application;</li>
  <li>When done processing <code>FSEvents</code> (my application quits for instance), I save the last event id encountered while processing events to be able to replay changes from that id;</li>
  <li>While my application is not running, the event id counter wraps around.</li>
  </ul>
  
  <p>My question is: How am I supposed to know the counter wrapped around? (Thus requiring me to re-scan the whole directory structure.)</p>