title: How deep can I nest backbone change events?
body: <p>Say I have a (rather ridiculous) book model who attributes look something like:</p>
  
  <pre><code>page:{
      paragraph:{
          wordcount: {
              the: 8,
              at: 10
          }
      }
  }
  </code></pre>
  
  <p>can I bind to change of very nested values like so?</p>
  
  <pre><code>book.on("change:page:paragraph:wordcount:the", ...);
  </code></pre>