During December 2025, Fan Pei focused on enhancing the reliability of stream processing in the redis/redis repository. He addressed a complex bug in the streamReplyWithRangeFromConsumerPEL function, correcting stream ID comparison logic to ensure accurate handling of consumer-group workflows. Working primarily in C, he improved the system’s ability to process streams correctly, especially in scenarios where the end parameter was NULL, thereby reducing the risk of logical errors in large-scale deployments. His work demonstrated strong skills in C programming and system-level debugging, contributing to the maintainability and correctness of Redis’s streaming components without introducing new user-facing features.