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Related: one of my colleagues created [wasm-smith](https://github.com/bytecodealliance/wasm-tools/tree/main/cra...) for fuzzing wasmparser and Wasmtime.
The end of the related work section cites both wasm-smith and the Binaryen fuzzer (https://github.com/WebAssembly/binaryen/wiki/Fuzzing) and says, "They both provide a fuzzer that turns a stream of bytes into a WebAssembly module in order to test implementations. Their fuzzers always generate semantically valid test cases, but lack the targeting and tuning that Xsmith provides."
I look forward to reading more about how they do the targeting and tuning.