During November 2025, Tiehexue worked on the IBM/vllm repository, focusing on enhancing system stability and correctness for cache sizing in large-scale inference workloads. He addressed a critical bug by modifying cache size calculations to cast return values to int64_t, thereby preventing potential overflows when handling large cache configurations. This change improved type safety and reliability, aligning with production performance and scalability requirements. Utilizing C++ and leveraging his expertise in performance optimization and system programming, Tiehexue’s contribution reduced operational risk in high-load environments and ensured that cache management remained robust and dependable for demanding inference scenarios.