During December 2025, Jin Gong focused on backend development for the pion/interceptor repository, addressing a critical issue in packet statistics reporting. He resolved an underflow bug in the PacketsReceived metric by transitioning to signed int64 arithmetic and implementing logic to clamp negative values to zero, thereby preventing erroneous wrap-around and ensuring accurate, non-negative packet counts. This targeted fix improved the reliability of monitoring and reporting packet loss without introducing performance regressions in the statistics computation path. Jin Gong documented the rationale and approach for this change, supporting future maintainability. His work utilized Go and demonstrated careful attention to correctness.