routes => :except being inherited by sub-level resources

This route declaration

resources :artists, :except => [:new,:create] do
  resources :releases do
    resources :tracks
  end
end

Supresses the :new and :create routes for releases and tracks too. To put them back in I had to:

resources :artists, :except => [:new,:create] do
  resources :releases, :except => [:none] do
    resources :tracks
  end
end

Which seems odd. Is this the new expected behavior?