During July 2025, John worked on the oxcaml/oxcaml repository, focusing on improving the correctness and maintainability of module bounds logic within the compiler. He addressed a bug in the is_max function of Jkind_mod_bounds, ensuring that maximum module bounds are now accurately identified by comparing against a consolidated maximum value. This involved refactoring the max bound definition for greater clarity and reliability, with all changes clearly documented and minimally disruptive to the codebase. John applied his expertise in compiler development and type systems, utilizing ML to deliver a targeted fix that enhanced the robustness of module boundary detection in the project.