title: knockoutjs 'optionsValue' doesn't work
body: <p>I have a code that doesn't work.
  This is here <a href="http://jsfiddle.net/JPBarbosa/uxwTM/4/" rel="nofollow">http://jsfiddle.net/JPBarbosa/uxwTM/4/</a>.</p>
  
  <p>The data bind parameter <strong>optionsValue</strong> doesn't work like parameter <strong>optionsText</strong>.</p>
  
  <p>I'm using the same function for both!</p>
  
  <pre><code>&lt;select data-bind="options: times, optionsText: function(item) { return item.toLocaleTimeString(); }, optionsValue: function(item) { return item.toLocaleTimeString(); }, value: selectedTime"&gt;&lt;/select&gt;
  </code></pre>
  
  <p>Regards, JP.</p>