Element#delete_element does not return deleted element

[fbuilesv]

According to the docs, delete_element returns the element that was returned but this is not the case. See example:

      root = Document.new ""
      node = REXML::Element.new("some_node")
      root.add_element node
      del_node = root.delete_element node

In this case del_node should equal node but it's nil.