title: Knockout observable array, get updated item value on change event
body: <p>I'm using knockout.js for an editable table, and I'm trying to fire a validation function when an input field value within the table is changed.</p>
  
  <p>I have tried using an editable computed observable: <a href="https://stackoverflow.com/questions/11078016/change-event-on-select-with-knockout-binding-how-can-i-know-if-its-a-real-chang">change event on select with knockout binding, how can i know if its a real change</a> (mhu's answer)</p>
  
  <p>I have tried using observable extenders: <a href="http://knockoutjs.com/documentation/extenders.html" rel="nofollow noreferrer">KO Extenders</a></p>
  
  <p>I have also tried using the change event:</p>
  
  <p><a href="http://jsfiddle.net/JePJh/1/" rel="nofollow noreferrer">JSFiddle</a>!</p>
  
  <p>Each time I have tried, only the original value is returned.</p>
  
  <p>What is the standard way to intercept the new value of an <code>observableArray</code> item in order to validate the new value?  Is this not bread-and-butter stuff for KO?</p>