title: Is the order of SKNode.nodesAtPoint guaranteed?
body: <p><code>SKNode</code> has a method <code>nodesAtPoint</code> which returns an array of children nodes that intersect given point.  Is the order of the elements in such array deterministic (e.g. by drawing order)?</p>
  
  <p>I could not find an answer in documentation, so probably the answer is "no", but I would like to verify.</p>