title: Create a Swift Dictionary subclass?
body: <p>Can I subclass a <code>Swift</code> <code>Dictionary</code> so that I can pass my custom <code>Dictionary</code> to methods that expect an ordinary <code>Dictionary</code>?</p>
  
  <p><strong>Edit</strong></p>
  
  <p><a href="https://stackoverflow.com/q/28633703/9636">In my case, I want my custom <code>Dictionary</code> to iterate through its keys in insertion-order.</a></p>