During August 2025, Ahlincq focused on hardening class instantiation behavior in the Chimera repository. They addressed a subtle bug by implementing strict safeguards using the Python C API, specifically Py_TPFLAGS_DISALLOW_INSTANTIATION, to prevent instantiation of classes lacking a __new__ method in Python 3.10 and above. Their approach included PyPy compatibility workarounds and refined error messages to improve developer feedback. Ahlincq updated the test suite to ensure consistent behavior across CPython and PyPy environments. This work leveraged cross-platform compatibility expertise, Python, and Rust, resulting in more robust class instantiation logic and clearer error handling for Chimera’s codebase.