Improve collection item selector

[acostami]

Given the following HTML

<ul>
  <li class="original">Original</li>
  <li>Item 1</li>
  <li>Item 2</li>
</ul>

In order to select all items except the original one I would build a PO collection which looks like:

items: collection({
  scope: 'li:not(.original)',

  item: {
  }
})

In order to access the items, I would have to write something like page.items(1), but this is not working with the current implementation because the selector will be $("li:not(.original):nth-of-type(1)") and the result will be empty in this case.