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>Isn't there one more issue? I'm not at all certain that a precise >collector would be more efficient. With conservative GC you have to >scan the stack once per GC. With precise GC, you have to do >bookkeeping (both registering and off-registering) for every single >SCM variable occuring on the stack between GC:s... But it may be a lot easier to implement incremental collection with explicit marking.