One of the improvements that you get from the coming Wasm GC proposal is an object model that is inherently more space-efficient than JavaScript. While a lot of

One of the improvements that you get from the coming Wasm GC proposal is an object model that is inherently more space-efficient than JavaScript. While a lot of speculative optimizations can make JITed JS (of the right form) run fast with few checks, the object model inherently requires boxing or tagging and is not as memory-efficient as what Wasm GC structs give.