verify_and_upgrade_legacy_signed_message

# File actionpack/lib/action_dispatch/middleware/cookies.rb, line 182
      def verify_and_upgrade_legacy_signed_message(name, signed_message)
        deserialize(name, @legacy_verifier.verify(signed_message)).tap do |value|
          self[name] = { value: value }
        end
      rescue ActiveSupport::MessageVerifier::InvalidSignature
        nil
      end