During September 2025, Lilran focused on refactoring the bitwise operator API in the moonbitlang/core repository, targeting the Int and UInt numeric types. By introducing explicit trait-based implementations using the impl keyword, Lilran clarified the API and aligned it with established Rust-style trait patterns. This approach improved the maintainability and discoverability of bitwise operator behavior, ensuring greater consistency and safety across core numeric types. Working primarily with MoonBit and leveraging expertise in bitwise operations, compiler development, and language design, Lilran’s work laid a solid foundation for future extensions while enhancing the clarity and structure of the core language API.