Breaking change in request.path_parameters

In rails 2.3.5 request.path_parameters goes from string to string eg: {"action" => "foo", "controller" => "bar"}

In rails 3 request.path_parameters goes from symbol to string eg: {:action => "foo", :controller => "bar"}

Even though its more efficient this change regresses some places the depend on a parity between path_parameters and params since params still goes from string to string.

There should be parity here or it will cause confusion.