title: How can I add a boolean value to a NSDictionary?
body: <p>Well, for integers I would use <code>NSNumber</code>. But YES and NO aren't objects, I guess. A.f.a.i.k. I can only add objects to an <code>NSDictionary</code>, right?</p>
  
  <p>I couldn't find any wrapper class for booleans. Is there any?</p>