oh, actually it was my fault. I have an air charger and a pro charger, and it turns out they're not interchangeable. The pro charger is, like, 30% bigger, and the laptop battery will not discharge while I'm using that one.
My laptop is one of the older magsafe ones, so the people talking about USB-C might be a YMMV kind of thing.
do you consider that to be a faulty behavior, or just par-for-the-course of heavy workloads on mobile platforms?
i'd hate for that to be the new norm, I use the hell out of my mobile computers, I don't need them draining before I even unplug.