Zig tracking issue

[Sobeston]

Overall we're very happy with using Zig. We've been following the latest major release.

Some pain points, with some related issues linked:

• Compilation speed
  We use almost exclusively Debug and ReleaseSafe. For example, changing one line and re-building one test in Debug takes somewhere around 20 seconds right now which interrupts flow. Incremental seems a long way out still, but using self-hosted backends for our Debug builds on x86-64-linux and aarch64-macos would be great.
  enable the x86 backend by default for debug builds on x86_64-linux ziglang/zig#22257
  100% behavior tests passing for the aarch64 backend ziglang/zig#21172

• Implicit pass by reference
  This can be a bit of footgun as-is. As I understand, this is already on its way out of the language, we just don't know when. It has been a source of confusion.
  eliminate hidden pass-by-reference footguns ziglang/zig#5973 (comment)

Some newer features we're particularly happy with:

• Build system and package manager
  We've been getting a lot of mileage out of it, and are maintaining a few (hopefully reusable) packages:
  • lmdb-zig
  • rocksdb-zig
  • base58-zig
  • zstd.zig

Things that aren't priorities for us:

• Removing LLVM from the compiler as a whole. We'll still want highly optimised builds, and we'll still want Clang for some important dependencies.