code: public void preloadChildList(List nodeList) {
          Iterable<Node> nodes = Linqy.cast(nodeList);
          preloadChildren(nodes);
      }
docs: Preload the items in a List by visiting each in turn
  Required for pieces of test XML whose node children can be visited
  out of sequence by a DifferenceEngine comparison
  
  <p>Makes the nodes of this list known as nodes that are
  visitable at the current level and makes the last child node
  the current node as a side effect.</p>
  
  @param nodeList the items to preload