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brotli compresses it to 1047967 bytes. And you can serve it as-is with Content-Encoding: br, unlike zstd.

(zstd at --ultra -22 level: 1149751 bytes).

Why is Brotli more efficient on Wasm files? I believe their built-in dictionary was tuned for HTML, CSS and JS content.

I'd guess that the context model (based on last 1-2 bytes) can be used to separate opcodes and their parameters.