Because of undefined behavior, bad error reporting, and never being able to implement proper GC, among other reasons.
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Why wouldn’t a conservative GC be competitive?
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It can’t be a moving GC, which means it can’t have bump allocating TLABs in the nursery. So malloc will be slower than it needs to be.
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Yeah, but if you’re just tinkering with something it doesn’t matter
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Agreed. My concern is that throwaway projects tend to become production projects :) The move from a production conservative GC to a production moving GC is usually too steep of a hill to overcome. It took SpiderMonkey a decade, I think?
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