Bun Rust rewrite: "codebase fails basic miri checks, allows for UB in safe rust"

The Bun project's Rust codebase was found to have issues with undefined behavior (UB) in safe Rust, which was discovered through miri checks. This is a concern because UB can lead to crashes or security vulnerabilities. The project is now rewriting parts of the codebase in Rust. Engineers should review the issue and consider the implications for their own projects. The Bun team is working to address these issues.