named routes does not handle parameters with a "." in the values

Hello,

I have the following problem with the routes... I first thought it was a mis-configuration from my part but I can reproduce it at will on a blank new application.

Let's say you have a resource called Dummy (with the routes and controller). From the console the following will fail with Rails 2.0.2, 2.1.0 and 2.1.1:

app.dummy_path(:id=>"a-sd.ef")
app.dummy_path("a-sd.ef")

All of those generates the same message:

ActionController::RoutingError: dummy_url failed to generate from {:controller=>"dummies", :action=>"show", :id=>"a-sd.ef"}, expected: {:controller=>"dummies", :action=>"show"}, diff: {:id=>"a-sd.ef"}
        from d:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/routing.rb:1415:in `raise_named_route_error'
        from d:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/routing.rb:1379:in `generate'
        from d:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/url_rewriter.rb:124:in `rewrite_path'
        from d:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/url_rewriter.rb:103:in `rewrite_url'
        from d:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/url_rewriter.rb:81:in `rewrite'
        from d:/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/integration.rb:214:in `url_for'
        from (eval):17:in `dummy_path'
        from (irb):9