> I see your comment above. This will need to be rebased after the
> other PR goes in, but I don't think it will be too hard to update
> things.

Thanks for doing review on this. Let me answer your points
during the weekend (I hope I'll find the time).

This PR will need a rebase, it depends both on dispersion
and linear solver.

Additionally I have a twin of this PR where there is even
more Gosper refactoring. But there are some more issues to
resolve before we can discuss that one.