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We actually wrote the original version in C with SIMD extensions as a Node.js binding, but the JavaScript version was still twice as fast. I kid you not. You will find the reason for this in the README, it's the last bullet point under "Fast": https://github.com/ronomon/hash-table#fast

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Huh. Does that apply to WASM too or just to binding from Node?

I am not sure but I wouldn't think so, unless you have to serialize/deserialize or otherwise transform or inspect function call arguments in some or other way, as you need to do when binding JavaScript with C.

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