Contributed a Redis API enhancement to the phpstan/phpstan-src repository by extending the Redis::mget return type to include false, addressing scenarios where requested keys are missing. This update was implemented in PHP and focused on improving backend reliability and type safety for static analysis. The work included developing new validation tests to ensure accurate detection of missing keys, thereby reducing the risk of false positives or negatives in Redis-driven workflows. By collaborating on this feature and expanding test coverage, the developer strengthened the maintainability and robustness of Redis integration within PHPStan, supporting safer and more predictable backend development practices.