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, reducing confusion for developers. The solution included explicit migration guidance and introduced an automated fix path using the mix format --migrate command, enabling smoother code migrations. Working primarily in Erlang, Aeturnum’s contribution improved the developer experience by aligning warning messages with Elixir’s deprecation policy and providing a clear, actionable path for updating affected codebases.