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Serde conditionally supports 128-bit integers. Here's the relevant snippet from serde's build.rs:

    // 128-bit integers stabilized in Rust 1.26:
    // https://blog.rust-lang.org/2018/05/10/Rust-1.26.html
    //
    // Disabled on Emscripten targets as Emscripten doesn't
    // currently support integers larger than 64 bits.
    if minor >= 26 && !emscripten {
        println!("cargo:rustc-cfg=integer128");
    }

If we add the obvious implementations to de.rs and ser.rs then it works.

For example in this function we are dealing with a mut reference to a mut reference to a Serializer which contains a mut reference to Vec<u8> which contains a pointer to data. Unclear whether 4 layers of indirection affects performance but let's experiment.