FYI No -Res Stacking with Venom Grenade

[Justisaur]

Just a quick FYI, as I hadn't seen this confirmed or denied anywhere, but with the high recharge I've got now, and I was testing interface procs, I could see that Venom Grenade's -resist doesn't stack with itself.  I should have expected that as most powers don't stack with themselves, but just confirming it.   Arctic Breath behaves similarly.