Y. Deng focused on enhancing Python 3.9+ compatibility for the unsloth-zoo repository by updating type hints and refactoring code to align with modern Python standards. Using Python and leveraging skills in compatibility and type hinting, Deng replaced union type pipes with typing.Union and adopted capitalized typing imports such as List, Dict, and Tuple. This targeted engineering effort preserved existing runtime behavior while enabling future improvements in static typing. The work reduced upgrade risk and improved maintainability for Python 3.9+ deployments, ensuring that new contributors can onboard more easily and that the codebase remains robust against compatibility regressions.