From now on, parameters defined in default_url_options can be absent from named routes.

This allows the following setup to work:

  # app/controllers/application_controller.rb
  class ApplicationController
    def default_url_options(options=nil)
      { :locale => I18n.locale }
    end
  end

  # From your views and controllers:
  I18n.locale                 #=> :en
  users_url                   #=> "/en/users"
  users_url(:pl)              #=> "/pl/users"
  user_url(1)                 #=> "/en/users/1"
  user_url(:pl, 1)            #=> "/pl/users/1"
  user_url(1, :locale => :pl) #=> "/pl/users/1"

If you provide all expected parameters, it still works as previously.
But if any parameter is missing, it tries to assign all possible ones
with the hash returned in default_url_options or the one passed straight
to the named route method.

Beware that default_url_options in ApplicationController is not shared
with ActionMailer, so you are required to always give the locale in your
email views.

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