Worked on the denoland/deno_core repository to address memory safety concerns related to aliasing in the ArenaBox and TypeErased components. Focused on aligning the codebase with the Tree Borrows model, the work involved refactoring memory management by removing DerefMut and AsMut implementations and migrating to raw pointers. This approach enforced stricter aliasing rules, reducing the risk of undefined behavior from improper shared and mutable reference usage. Utilizing Rust and leveraging expertise in concurrency, memory management, and pointer safety, the changes fixed a critical bug and improved the foundation for future features requiring robust memory correctness within the codebase.