Worked on the python/mypy repository to enhance MypyC’s handling of equality method generation, specifically addressing issues arising from package import cycles. Focused on refining the generation of not-equal methods when inherited __eq__ implementations are present, ensuring that type accuracy is maintained even when concrete method bodies are unavailable. Utilized Python and type checking expertise to improve the gen_glue_ne_method by leveraging the right-hand side argument’s type, which increased the reliability of equality checks. This work reduced false positives and negatives in the type checker, contributing to more robust software development and testing practices for large Python codebases.