> having to retroactively add checks like... we already have typed arrays in JS so I don't think this would be any different
> I _think_ that moderns virtual machines already did these optimisations despite there isn't a TypedArray like that. It's a bit of a mess to create an Array that is not holed and gets best optimizations [1], and this proposal would like to address that exact case. [1] https://v8.dev/blog/elements-kinds
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