docs/_docs/contributing/procedures/contributing-to-stdlib.md
The Scala standard library is hosted in the scala/scala3 repository. Any changes that influence the standard library API should follow this process. If the changes are only internal, the process is the standard pull request one.
Currently, the working group is mainly comprised of compiler team members. However, if anyone else is interested in participating, they can do so by contacting the Coordinator. Inclusion in the working group must be approved by the Scala Core team. Of course, anyone can participate in the PR review workflow by commenting on the PR.
Current Coordinator can be found on the Scala Core Team page.