class ActionDispatch::Session::CookieStore

def unpacked_cookie_data(req)
  req.fetch_header("action_dispatch.request.unsigned_session_cookie") do |k|
    v = stale_session_check! do
      if data = get_cookie(req)
        data.stringify_keys!
      end
      data || {}
    end
    req.set_header k, v
  end
end