shallow nesting of resource routes does not respect namespace

It appears that when using shallow => true for nested resource routes within a namespace, the namespace is not being considered for the shallow routes.

If I describe nested routes within a namespace as follows:

  map.namespace :admin do |admin|
    admin.resources :parents do |parent|
      parent.resources :children
    end
  end

I will get the following routes when I run rake routes:

                    admin_parents GET    /admin/parents                                      {:controller=>"admin/parents", :action=>"index"}
          formatted_admin_parents GET    /admin/parents.:format                              {:controller=>"admin/parents", :action=>"index"}
                                  POST   /admin/parents                                      {:controller=>"admin/parents", :action=>"create"}
                                  POST   /admin/parents.:format                              {:controller=>"admin/parents", :action=>"create"}
                 new_admin_parent GET    /admin/parents/new                                  {:controller=>"admin/parents", :action=>"new"}
       formatted_new_admin_parent GET    /admin/parents/new.:format                          {:controller=>"admin/parents", :action=>"new"}
                edit_admin_parent GET    /admin/parents/:id/edit                             {:controller=>"admin/parents", :action=>"edit"}
      formatted_edit_admin_parent GET    /admin/parents/:id/edit.:format                     {:controller=>"admin/parents", :action=>"edit"}
                     admin_parent GET    /admin/parents/:id                                  {:controller=>"admin/parents", :action=>"show"}
           formatted_admin_parent GET    /admin/parents/:id.:format                          {:controller=>"admin/parents", :action=>"show"}
                                  PUT    /admin/parents/:id                                  {:controller=>"admin/parents", :action=>"update"}
                                  PUT    /admin/parents/:id.:format                          {:controller=>"admin/parents", :action=>"update"}
                                  DELETE /admin/parents/:id                                  {:controller=>"admin/parents", :action=>"destroy"}
                                  DELETE /admin/parents/:id.:format                          {:controller=>"admin/parents", :action=>"destroy"}
            admin_parent_children GET    /admin/parents/:parent_id/children                  {:controller=>"admin/children", :action=>"index"}
  formatted_admin_parent_children GET    /admin/parents/:parent_id/children.:format          {:controller=>"admin/children", :action=>"index"}
                                  POST   /admin/parents/:parent_id/children                  {:controller=>"admin/children", :action=>"create"}
                                  POST   /admin/parents/:parent_id/children.:format          {:controller=>"admin/children", :action=>"create"}
           new_admin_parent_child GET    /admin/parents/:parent_id/children/new              {:controller=>"admin/children", :action=>"new"}
 formatted_new_admin_parent_child GET    /admin/parents/:parent_id/children/new.:format      {:controller=>"admin/children", :action=>"new"}
          edit_admin_parent_child GET    /admin/parents/:parent_id/children/:id/edit         {:controller=>"admin/children", :action=>"edit"}
formatted_edit_admin_parent_child GET    /admin/parents/:parent_id/children/:id/edit.:format {:controller=>"admin/children", :action=>"edit"}
               admin_parent_child GET    /admin/parents/:parent_id/children/:id              {:controller=>"admin/children", :action=>"show"}
     formatted_admin_parent_child GET    /admin/parents/:parent_id/children/:id.:format      {:controller=>"admin/children", :action=>"show"}
                                  PUT    /admin/parents/:parent_id/children/:id              {:controller=>"admin/children", :action=>"update"}
                                  PUT    /admin/parents/:parent_id/children/:id.:format      {:controller=>"admin/children", :action=>"update"}
                                  DELETE /admin/parents/:parent_id/children/:id              {:controller=>"admin/children", :action=>"destroy"}
                                  DELETE /admin/parents/:parent_id/children/:id.:format      {:controller=>"admin/children", :action=>"destroy"}

This seems to me to be the proper, having admin before every route.

On the other hand, if I take the same resource routes, and make them shallow:

  map.namespace :admin  do |admin|
    admin.resources :parents, :shallow => true do |parent|
      parent.resources :children
    end
  end

Then when running rake routes I get the following routes:

             admin_parents GET    /admin/parents                           {:controller=>"admin/parents", :action=>"index"}
   formatted_admin_parents GET    /admin/parents.:format                   {:controller=>"admin/parents", :action=>"index"}
                           POST   /admin/parents                           {:controller=>"admin/parents", :action=>"create"}
                           POST   /admin/parents.:format                   {:controller=>"admin/parents", :action=>"create"}
          new_admin_parent GET    /admin/parents/new                       {:controller=>"admin/parents", :action=>"new"}
formatted_new_admin_parent GET    /admin/parents/new.:format               {:controller=>"admin/parents", :action=>"new"}
               edit_parent GET    /parents/:id/edit                        {:controller=>"admin/parents", :action=>"edit"}
     formatted_edit_parent GET    /parents/:id/edit.:format                {:controller=>"admin/parents", :action=>"edit"}
                    parent GET    /parents/:id                             {:controller=>"admin/parents", :action=>"show"}
          formatted_parent GET    /parents/:id.:format                     {:controller=>"admin/parents", :action=>"show"}
                           PUT    /parents/:id                             {:controller=>"admin/parents", :action=>"update"}
                           PUT    /parents/:id.:format                     {:controller=>"admin/parents", :action=>"update"}
                           DELETE /parents/:id                             {:controller=>"admin/parents", :action=>"destroy"}
                           DELETE /parents/:id.:format                     {:controller=>"admin/parents", :action=>"destroy"}
           parent_children GET    /parents/:parent_id/children             {:controller=>"admin/children", :action=>"index"}
 formatted_parent_children GET    /parents/:parent_id/children.:format     {:controller=>"admin/children", :action=>"index"}
                           POST   /parents/:parent_id/children             {:controller=>"admin/children", :action=>"create"}
                           POST   /parents/:parent_id/children.:format     {:controller=>"admin/children", :action=>"create"}
          new_parent_child GET    /parents/:parent_id/children/new         {:controller=>"admin/children", :action=>"new"}
formatted_new_parent_child GET    /parents/:parent_id/children/new.:format {:controller=>"admin/children", :action=>"new"}
                edit_child GET    /children/:id/edit                       {:controller=>"admin/children", :action=>"edit"}
      formatted_edit_child GET    /children/:id/edit.:format               {:controller=>"admin/children", :action=>"edit"}
                     child GET    /children/:id                            {:controller=>"admin/children", :action=>"show"}
           formatted_child GET    /children/:id.:format                    {:controller=>"admin/children", :action=>"show"}
                           PUT    /children/:id                            {:controller=>"admin/children", :action=>"update"}
                           PUT    /children/:id.:format                    {:controller=>"admin/children", :action=>"update"}
                           DELETE /children/:id                            {:controller=>"admin/children", :action=>"destroy"}
                           DELETE /children/:id.:format                    {:controller=>"admin/children", :action=>"destroy"}

It seems to me that shallow resource routes should take into account the namespace which they are in, and only make them shallow for that namespace, not globally to the root of the rails app.

I have attached the app I created to illustrate this problem.