Related: #1932

Safari 16.4 is going to be released soon. It means that now all major browsers + Node.js + Deno will support WASM fixed-width SIMD:

• Chrome 91
• Firefox 89
• Safari 16.4
• Node.js 16.4
• Deno 1.9

So I think now is a good point start experimenting SIMD... but in a separate branch. Maybe until safari >=16.4 is adopted by most of users, and until Node.js drops v14 support.

The good point of SIMD is that we can enable it package-by-package. The main module is not affected, so (hopefully) we only need to fix meta.yaml files. Thus I think syncing and resolving conflicts would not be very hard.

WDYT?