Worked on the oven-sh/bun repository to address UTF-8 file path encoding issues in Bun’s file I/O operations, focusing on stability and correctness. Delivered a targeted fix for encoding corruption in Bun.file().stat() and Bun.file().delete() by updating the underlying Zig code to use ZigString.fromUTF8(), ensuring accurate handling of internationalized filenames and emojis. Developed comprehensive regression tests in TypeScript to cover a range of non-ASCII characters and validated results against Node.js fs for parity. This work improved reliability for UTF-8 paths, reduced production risks, and enhanced support for global users by aligning file API behavior with internationalization standards.