During January 2025, Aeturnum enhanced the elixir-lang/elixir repository by refining the handling of single-quoted charlists deprecation. Focusing on compiler development and language design, Aeturnum clarified that the warning for single-quoted charlists is a deprecation notice rather than a stylistic suggestion, directly addressing developer confusion. The solution included explicit migration guidance and introduced an automated fix path using the mix format --migrate command, enabling seamless code updates. Working primarily in Erlang, Aeturnum’s contribution improved the developer experience by aligning warning messages with Elixir’s deprecation policy and facilitating smoother migrations, demonstrating thoughtful attention to language evolution and usability.