Thank you for your interest in contributing to marker.js 2. Before you proceed, please read this short guide.
marker.js 2 is not a "true" OSS project. It's a personal (private) project with a source code repository publicly available.
Therefore, it would be an unnecessary burden to resolve all the legal and other issues arising from accepting third party code contributions.
If you find a bug or want to make a feature request, please open an issue, and let's discuss it there.
Thank you, Alan.