map.resources does not work well when multiple entities provided

when I write routes like this in routes.rb

map.resources :books,:users,:requirements=>{:id => /\d+/}

the requirements only work for ":books"---the first entitiy provided.

The "hash shallow copy" arose this bug. (:requirements=>{:id => /\d+/} is a nested hash)

code from actionpack\lib\actioncontroller\resources.rb

def resource(*entities, &block)
  options = entities.extract_options!
  entities.each { |entity| map_singleton_resource(entity, options.dup, &block) }
end

I mean that , we should pass a deep copy of options to method "map_singleton_resource", not "options.dup" which is shallow copy.