serializer

# File actionpack/lib/action_dispatch/middleware/cookies.rb, line 557
        def serializer
          @serializer ||=
            case request.cookies_serializer
            when nil
              ActiveSupport::Messages::SerializerWithFallback[:marshal]
            when :hybrid
              ActiveSupport::Messages::SerializerWithFallback[:json_allow_marshal]
            when Symbol
              ActiveSupport::Messages::SerializerWithFallback[request.cookies_serializer]
            else
              request.cookies_serializer
            end
        end