Render :action doesn't honour named routes

Given the following.

A UserSessions controller with 'New' and 'Destroy' actions and the following in the routes.rb file.

map.login "login", :controller => 'user_sessions', :action => 'new'

map.resources :user_sessions

Inside the controller a "render :action => 'new'" will always result in a URL of http://example.com/user_sessions/new instead of http://example.com/login despite map.login having a higher priority and pointing to the same controller and action.

I would have expected render to honour the route, or failing that allow the use of named routes as one of the render methods.