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Bun, the popular JavaScript runtime written in Zig, is being rewritten in Rust — partly using AI agents running in parallel. The author explores the layered problems behind this decision: Zig's memory safety issues and cross-platform instability (especially on Windows), Bun's acquisition by Anthropic and uncertainty about its future, and the broader trend of developers like Dax (OpenCode) moving away from Bun to Node.js. The Rust rewrite is framed as both an AI-assisted engineering experiment and a pragmatic response to real stability problems. The author draws parallels to the TypeScript-to-Go port, discusses the technical challenges of the Rust migration (unsafe calls, crate layering, compile times), and ends cautiously optimistic but uncertain about the outcome.