Yaegi is an open source project, and your feedback and contributions are needed and always welcome.
Issues and Pull Requests are opened at https://github.com/containous/yaegi.
Non trivial changes should be discussed with the project maintainers by opening a Feature Request clearly explaining rationale, background and possible implementation ideas. Feel free to provide code in such discussions.
Once the proposal is approved, a Pull Request can be opened. If you want to provide early visibility to reviewers, create a Draft Pull Request.