djb2 hash in WebAssembly and Javascript

Interesting observation that djb2 hash is remarkably faster in WASM, despite operating on 32-bit ints (like all bit ops in JS), and despite having to copy data to WASM memory, while JS has direct access:

5,000,000 wasm (add): 5463.410ms
b390d842
5,000,000 js (add): 27483.076ms
b390d842
5,000,000 wasm (xor): 5939.867ms
8c94c642
5,000,000 js (xor): 25120.488ms
8c94c642