During November 2024, Hexcy focused on improving the reliability of state management in the TanStack/store repository by addressing a subtle bug in shallow equality checks for Map and Set objects. Using TypeScript and JavaScript, Hexcy implemented logic to validate Map entry pairs, compare Map sizes, and ensure strict equality of Set values, which resolved issues with false re-renders and incorrect memoization in frontend applications. This targeted bug fix enhanced the accuracy of change detection for Map and Set-based state keys, reduced edge-case errors, and provided clear documentation to support future maintenance and testing of the store’s core data structures.