Again, it never stopped giving me useful numbers on the screen.
ZH-L doesn't care, if they do a lock-out, it'll be extra code on the side added for a**-covering reasons. Unlike those other algorithms where you could push some voodoo-bubble-fudge coefficient far enough out of bounds where it won't compute anymore. In theory anyway: I haven't looked at VPM long enough to know if that's actually possible there, and who knows how RGBM does it -- but I suspect it may be the case with low-end "folded RGBM" computers, at least.