Worked on the facebookincubator/cinderx repository to enhance memory management for immortal types in C++. Addressed a critical memory safety issue by reverting a previous change that had blocked decref operation generation, thereby restoring correct reference counting and reducing the risk of memory leaks and use-after-free errors in long-running processes. The solution involved careful analysis of memory-management semantics and validation against existing differential revisions to ensure alignment with project standards. Utilized C++ development skills and rigorous testing practices to maintain repository traceability and stability. This targeted bug fix improved the reliability of memory handling without introducing new features during the period.