title: Run default serialization logic from JsonConverter
body: <p>I have a <code>JsonConverter</code> that, depending on an instance specific flag, needs to either</p>
  
  <ul>
  <li>run custom serialization logic</li>
  <li>run the default Json.NET serialization logic</li>
  </ul>
  
  <p>How can the default Json.NET serialization logic be ran from a <code>JsonConverter</code>?</p>
  
  <p>Thanks</p>