JavaScript:ActionMonkey:Stage 0 Whiteboard
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General issues
If there's anywhere a GCThing has pointers to non-GC-managed memory that contains pointers back into GC-managed memory, we have a problem. Exact GC lets you do that (you know how to traverse the non-GC-managed memory). MMgc doesn't.
I don't know that SpiderMonkey does this anywhere. If it does, one fix is to change those data structures to live in GC-managed memory. So the fix itself is easy: finding the offenders is the interesting bit.