Worked on the bkeepers/vueuse repository to address a critical issue in route query handling, focusing on the distinction between null and undefined values in route parameters. Applied expertise in Vue.js, the Composition API, and frontend testing to deliver a targeted bug fix that preserves the original intent of route state, preventing both values from being normalized to undefined. Developed and integrated automated tests in JavaScript and TypeScript to ensure the new behavior remains stable and reliable. This work improved the consistency of navigation features across applications using VueUse, reducing the potential for future regressions and streamlining ongoing support efforts.