During August 2025, Ahlincq focused on hardening class instantiation behavior in the Chimera repository. They implemented 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. To ensure cross-platform compatibility, they introduced PyPy-specific workarounds and refined error messages for clearer developer feedback. The work included updating and expanding tests to verify consistent behavior across both CPython and PyPy environments. Using Python and Rust, Ahlincq addressed a nuanced bug, demonstrating depth in cross-environment testing and low-level language integration within the Chimera project.