During January 2026, this developer enhanced the ACL2 repository by refactoring the int-vector-adders-meta.lisp file to introduce a second parameter, 'sc', to the rp handling within the Vector Adder Meta module. This addition enabled bitp-specific behavior, increasing the flexibility and maintainability of vector operations. Working exclusively in Lisp, the developer applied functional programming and algorithm design skills to address the requirements outlined in issue #1886, ensuring clear traceability through a dedicated commit. The work focused on extensibility and robustness, resulting in a targeted feature that improved the meta-collection’s adaptability without introducing new bugs or unnecessary complexity.