P.S. Re: weak pointers
I didn't mention this right when it came up a few days ago, but there's a
second important use case for weak pointers in the VM: the debugger. Since
a debugger shouldn't alter execution pattern, that should also include when
objects get rounded up for collection. In other words, each and every
pointer from the debugger to any object in a program-under-test should be
weak. When such a weak pointer goes out of scope, the debugger simply says
"object no longer exists", which is exactly informative.
Eric
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