title: How might I cancel a change to an observable array w/ Knockout 3.0?
body: <p>I have a change occurring to an array. I am using Sanderson's latest array subscription method to catch the add/delete change. In this subscription is where I intend to bundle and send my request over the wire. If the request fails for any reason I want to be able to cancel any possible changes to the collection. I have verified that this subscription is hit before the change propagates so I assume there would be a way to say "STOP DON'T DO IT" however I can't figure out how.</p>
  
  <p>As my example...</p>
  
  <pre><code>self.SourceData = ko.observableArray(data);
  self.SourceData.subscribe(function(changes) {
      var isAllGood = true;
      ko.utils.arrayForEach(changes, function(ch) {
          if (ch.value == doesNotMeetMyCondition) isAllGood = false;
      });
      if (!isAllGood) &lt;STOP DON'T DO IT&gt;
  }, null, 'arrayChange');
  </code></pre>
  
  <p>When inspecting 'this' I do see the ko.subscription object with the standard [callback, dispose, disposeCallback, target] but nothing seems to amount to STOP DON'T DO IT.</p>
  
  <p>Any thoughts would be quite helpful. Thanks.</p>