>Darwin itself is mostly unix+C. Hence, this does not respond to the parent, asking about GC in the OS itself. You're right, but just to clarify WRT your first

>Darwin itself is mostly unix+C. Hence, this does not respond to the parent, asking about GC in the OS itself. You're right, but just to clarify WRT your first paragraph, Obj-C did briefly have a GC'd runtime between the eras of manual and automatic ref counting.