Have been writing in D that has conservative GC for years. Yes, on 32-bit platform false pointers are a problem esp as you get closer to 1g for instance. On t

Have been writing in D that has conservative GC for years. Yes, on 32-bit platform false pointers are a problem esp as you get closer to 1g for instance. On the other hand on 64-bit I’ve never seen it at all. The chance of arbitrary long/double to point to some object in the heap area is 1/2^32 smaller and that turns the problem from common nuisance to purely theoretical problem.