Rails - Sep 2009 - url with some%Fvalue treated differently than some_value

My setup:

passenger via Apache
rails 2.3.2

RailsBaseURI /scala_tour

going to http://www.naildrivin5.com/scala_tour works great

Someone posted a link to http://www.naildrivin5.com/scala%5Ftour and I
get this in my log:

ActionController::RoutingError (No route matches "/scala%5Ftour" with
{:method=>:get}):

The browser window renders the underscore.  Reloads cause the same
problem.  If I copy/paste the link to a new tab, all is well.

What''s weird is that Passenger is clearly detecting that scala%5Ftour
should be routed to scala_tour, but then the Rails app gets totally
confused by this.

Anyone experience this?  Any ideas how to deal with it (other than
changing the context so the _ isn''t there)

Dave