title: Send NSMutableArray as JSON using JSON-Framework
body: <p>I'm using JSON-Framework in my project successfully to decode JSON send from a server.</p>
  
  <p>Now I need to do it the other way around and I'm facing problems as the data to be sent is a NSMutableArray fetched from CoreData.</p>
  
  <p>When using</p>
  
  <pre><code>NSString* jsonString = [menuItems JSONRepresentation]
  </code></pre>
  
  <p>I get the message "JSON serialisation not supported for MenuItems".</p>
  
  <p>Do I need to convert the NSMutableArray to some other format so the JSON-Framework can serialize it?</p>
  
  <p>Thanks for any help,<br>
  Miguel</p>