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 a targeted refactor of the max bound definition, resulting in clearer and more reliable code. Leveraging his expertise in ML and type systems, John delivered these changes with minimal disruption to the codebase, demonstrating careful attention to documentation and maintainability while resolving a nuanced issue in compiler development.