title: knockout "if binding" not working
body: <p>When debugging with Chrome, I can see CoverPrices has 9 elements. The foreach loop actually works well and the table looks correct with the first span being bound to Item1 correctly.</p>
  
  <p>However, the if binding does not work and both images are displayed. Yet, all the elements in Item2 have the true value, so only the first image should show up.</p>
  
  <pre><code>&lt;!-- ko foreach: CoverPrices --&gt;
      &lt;tr&gt;
          &lt;td&gt;
              &lt;span data-bind="text: Item1"&gt;&lt;/span&gt;
          &lt;/td&gt;
          &lt;!-- ko foreach: Item2 --&gt;
          &lt;td&gt;
              &lt;img src="~/Images/yes.png" alt="oui" data-bind="if: $data" /&gt; 
              &lt;img src="~/Images/no.png" alt="non" data-bind="ifnot: $data" /&gt; 
          &lt;/td&gt;
          &lt;!-- /ko --&gt;
      &lt;/tr&gt;
      &lt;!-- /ko --&gt;
  </code></pre>
  
  <p>Is there something wrong with my binding ?</p>