Worked on the oven-sh/bun repository to improve runtime stability and memory safety in asynchronous Promise code paths. Focused on debugging and system programming using Zig, the developer addressed a critical use-after-free bug by correcting hash map pointer handling within the Promise branch. The solution involved validating the fix with targeted repro cases, ensuring the crash surface was eliminated without introducing new dependencies or tests. Additionally, the work included documenting memory management techniques relevant to Rust and C++ interop, as well as clarifying macro usage and hash map safeguards, which enhanced maintainability and traceability throughout the codebase during the month.