In October 2025, Hnnynh refactored the _json module in the picnixz/cpython repository, focusing on modernizing its API surface by integrating Argument Clinic. This work involved rewriting method definitions in C to use structured signatures, removing outdated parsing logic, and aligning the module with current CPython development standards. By leveraging C programming and the Python C API, Hnnynh improved the clarity and maintainability of the module’s codebase, making future enhancements and documentation more straightforward. The depth of the refactor addressed both implementation and documentation needs, laying a foundation for ongoing modernization within the CPython project’s core modules.