Greg focused on improving data integrity in the xh/hoist-react repository by refining the validation logic for view name uniqueness. He addressed a bug in the ViewManagerModel where global and owned views were not properly distinguished, which previously led to false duplicate errors. By updating the validation to check the correct set of views based on their scope, Greg ensured that global views no longer triggered incorrect duplicate name warnings. This work, implemented using TypeScript and frontend development best practices, enhanced both developer experience and application correctness. The targeted fix demonstrated careful attention to edge cases and commit-level traceability for future maintenance.