The only Bun shipped product I've used in anger is OpenCode and I regularly run into segfaults on it. I doubt this is the reason for migration but every time it happens, it reminds me the real cost of unsafe code. That being said, Zig is an absolute pleasure to write and I can't wait until it has a real library ecosystem, Rust's greatest boon.

the rust port (at least currently) heavily uses unsafe as well

https://github.com/oven-sh/bun/compare/claude/phase-a-port#d...

that isn't particularly surprising, but the point is I would expect getting things more stable than the zig version would take a bit.