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Also curious - how do you handle "number"? i32, i64, doubles, floats, i16 etc have very different performance characteristics. Also, things like sparse arrays, Error.stack etc. I haven't documented them in my project yet, but it's quite high up in the list of things people actually care about.

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A plain number is a double, and then the compiler can prove it can be a 64-bit integer if the size is appropriate. The goal is to keep behavior parity with Node here. Loop counters etc stay double. But we also support custom types we introduced such as i32, which is crucial for embedded performance. And then of course we have proper typed arrays.

Regular arrays are dense, but we keep a presence bit for every element so we can identify sparse arrays and differentiate holes from undefined's. And finally, there's no Error.stack support right now.

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