title: Aurelia select multiple doesn't bind the value while select does
body: <p>I faced some very strange thing. I have select and select multiple elements. When I first load the page with the form, and change selected options in select multiple, it doesn't bind new value to a variable in select multiple (although it binds correctly if it is just select, not multiple). But then if I do something on the page that requires updating data in the form (for example, I push the button Revert that loads data in the form from db), it starts binding new selected options in select multiple. I am confused</p>
  
  <p>For example:</p>
  
  <pre><code>&lt;select multiple class="form-control input-sm" value.bind="workers"&gt;
      &lt;option repeat.for="option of selectors.worker" model.bind="option.value" disabled.bind="option.disabled"&gt;
        ${option.name}
      &lt;/option&gt;
    &lt;/select&gt;
    ${workers}
  </code></pre>
  
  <p>${workers} is not updated if I change selected options</p>