[Alarm Controller] - Info

Hi all,
I’m trying to use the Alarm Controller by @gerrieg on OpenHab 2.4
I cannot find any information about the binding, so I was wondering if it is still supported…

Anyway, I have a question about the Zones.
If I have more than one contact connected to Zone1 (to make an example) and if one of them opens the alarm is triggered as supposed.
If I’m in disarm and one or more contacts are OPEN, the Can_arm_external switch to OFF, and that’s ok, but if I had more than one contacts OPEN and ONLY one become CLOSED, the switch return ON, and I think, that’s not correct (until all contacts in Zone1 are CLOSED, the switch must stay OFF)
Is this correct, or I’m missing something?