During November 2025, Hei Hei Ho contributed to the DefinitelyTyped/DefinitelyTyped repository by addressing a nuanced networking issue in TypeScript type definitions. Hei focused on correcting the handling of netmask broadcast addresses for /31 and /32 routes, ensuring that the broadcast property is undefined where appropriate and aligning the types with real-world routing semantics. The solution included a targeted regression test, written in TypeScript, to safeguard against future errors and maintain stable behavior. This work demonstrated careful attention to edge cases and a strong grasp of testing practices, resulting in a robust, low-risk fix merged collaboratively with project maintainers.