Go doesn't yet have native SIMD support, but it actually might in the future: https://github.com/golang/go/issues/73787

I think when it's introduced it might be worth discussing that again. Otherwise providing assembly for JSON of all packages seems like a huge maintenance burden for very little benefit for end users (since faster alternatives are readily available)

Interesting that the proposal is for low-level intrinsics as well as a non-processor-specific api: > Our plan is to take a two-level approach: Low-level architecture-specific API and intrinsics, and a high-level portable vector API. The low-level intrinsics will closely resemble the machine instructions (most intrinsics will compile to a single instruction), and will serve as building blocks for the high-level API.