[qubes-users] Kill switch on the Qubes OS contributed package tunnel package?

Since i think the package was forked from your work I thought I would ask if you knew if the package included a kill switch? I noticed on your qubes github page it mentioned "fail close" which is the same thing? If yes, then i am guessing its safe to assume that the forked qubes package also includes a fail close/killswitch?
Thank you very much