I ran into another quirk with MAP_JIT recently, but going the other direction in time. If you supported an older platform (High Sierra, which up until recently

I ran into another quirk with MAP_JIT recently, but going the other direction in time. If you supported an older platform (High Sierra, which up until recently was... valid...), you would need to explicitly _not_ pass MAP_JIT into mmap there. It makes total sense once you find the bug, but it was also an easy one to overlook. Tracking that down was kind of annoying.