> Battle-tested, mature code > fresh rewrite.

> Existing Zig codebase has seen X amount of battle-testing. Rust rewrite: 0 (except -I'm assuming- passing test suites).

Not taking a side here in the whole Bun vs. ZSF dispute, but isn't the entire selling point of Rust that you get a bunch of battle-tested guarantees simply from compiling the program? Is there even a metric for battle-tested? I would say something like sqlite is battle tested vs a vibe-coded network server in c, but does that mean rewriting anything in rust truly mean starting all the way back at square one?

Also, didn't Anthropic roll out a version of CC using the Rust rewrite of bun? Surely they didn't just say "works on my machine" and chuck it into production?