Worked on enhancing the Ly display manager configuration within the katexochen/nixpkgs repository, focusing on improving type safety and maintainability for NixOS users. The approach involved replacing the previous attrsOf structure with iniFmt.lib.types.atom, simplifying the settings type to make configurations safer and more readable. This refactoring laid the groundwork for safer configuration-as-code practices and reduced the maintenance burden for future updates. The work was implemented using Nix and NixOS configuration skills, with careful attention to code cleanup and formatting. The result unified these improvements into a single feature, providing clearer extension paths for Ly configuration in NixOS.