ActionView::Base::ObjectWrapper -- What's it for?

I've been going through the code and noticed this class as part of the ActionView base.rb.

    class ObjectWrapper < #:nodoc:     end

As far as I can tell, it's just used in render_partial_collection when calling render_partial, but the only thing that's done with it is extract the value out of it again. As you can probably tell, I'm new to Ruby programming (mostly Java bg), so maybe there's some magic that happens by putting it into a struct, or maybe it's an extension point that people can use. If the latter is the case, would someone be able to provide an example of how it might be used?

Appreciate any help,

John Devine