title: Bool Property Cannot be marked dynamic in swift
body: <p>I'm trying to observe <code>Bool</code> value in swift using KVO and add <code>dynamic</code> modifier like this :</p>
  
  <pre><code>dynamic var isRestricted:Bool?
  </code></pre>
  
  <p>and the compiler say</p>
  
  <blockquote>
    <p>Property cannot be marked dynamic because its type canot be
    represented in Objective-C</p>
  </blockquote>
  
  <p>then what should I do? should I change to NSNumber for this? and What is the best practice for observing value then?</p>
  
  <p>im using xcode 7 beta 2</p>