[martingxx]

I agree about the discussion / issues aspects. I suspect doing that interoperably would be hard or impossible because of the vastly different feature sets on different hosts.

All I am looking for is a few interoperability features for the repositories themselves. In fact, if I were to describe the most important single feature, it would be something like this:

I am able do some work in my repo hosted on host A, which was originally cloned from a repo on host B, and offer it back to the author on host B to merge if they wish. I'd like to be able to do this by notifying them (in a way integrated into my workflow) with the same kind of information that `git request-pull` generates. Importantly I would not need an account on host B for this. Possibly this might need some one-off setup on the original authors side, perhaps adding my repo as an remote.

The use cases I have in mind here are mostly occasional contributions or minor changes. I don't think this would work well for people who are frequent major contributors - they would really need the discussion / issues aspects to collaborate effectively.