Bun’s experimental Rust rewrite reaches 99.8% test compatibility on Linux x64 glibc

Bun’s experimental rewrite in Rust has reportedly reached 99.8% test compatibility on Linux x64 glibc. The update follows recent discussion around guidance for porting projects from Zig to Rust.

The milestone suggests Bun’s Rust transition is becoming technically viable, at least on a major Linux target. It also reflects a broader trend of developer tooling teams reassessing language choices as they balance performance, safety, and maintainability.