During December 2024, Rafferty Yu focused on strengthening the Redis RESP protocol handling in the redis/redis repository. He addressed a critical bug in the addReplyBulk function, correcting a CRLF formatting index error that affected integer-encoded string replies. Using C and Tcl, Rafferty implemented targeted unit tests to validate bulk reply protocol behavior across various integer and string encodings, ensuring correct CRLF placement and preventing future regressions. His work improved protocol robustness and client compatibility by refining protocol framing in a sensitive code path. The depth of his fix and comprehensive testing demonstrated careful attention to code quality and maintainability.