Worked on enhancing the reliability of Redis cluster command handling within the JetBrains/phpstorm-stubs repository, focusing on backend stability. Addressed a bug in the RedisCluster::rawCommand method by updating its PHP signature to accept a variable number of arguments using variadic parameters, ensuring all arguments are correctly forwarded to the Redis server. This adjustment improved the robustness of multi-argument command transmission and reduced potential failure modes in Redis interactions. The work required a strong understanding of PHP and Redis, with careful attention to method signatures and argument forwarding, resulting in more stable and predictable behavior for developers using Redis clusters.