> Oh, they're converting Bun to unsafe rust. That's easy, but useless.

You really need to escape the Zig vs Rust language wars bubble to get a real read on what Bun was doing.

They started by attempting a more direct translation. Not quite transliteration but close. At this stage they wanted to bootstrap the codebase into Rust as quickly as possible using parallel agent sessions, which requires minimizing the number of refactors that cut across the codebase. After it was bootstrapped into Rust they continued on the rewrite to take advantage of Rust’s features.

The anti-Rust side has been clinging to that first step as evidence that it’s all broken, ignoring the fact that it was an intermediate step.

The “unsafe” part is also confusing a lot of non-Rust devs who don’t understand that unsafe is used in cases of crossing FFI boundaries, which Bun does a lot of by nature