Worked on the typst/typst repository to address a critical cross-platform bug affecting numbering stability in document processing. Focused on systems programming and type safety using Rust, the developer refactored internal counter and enumeration item representations from usize to u64. This technical approach ensured consistent numbering behavior across both 32-bit and 64-bit environments, reducing platform-specific anomalies and improving overall robustness. The solution was fully traceable through a dedicated commit and linked issue, providing a clear audit trail for future maintenance. No new features were added during this period, but the targeted bug fix enhanced reliability for Typst users across platforms.