This is very close to what I wish ObservableHQ/Pluto.jl had. Their reactive model already allows you to branch off, connect arbitrary nodes and re-run only what

This is very close to what I wish ObservableHQ/Pluto.jl had. Their reactive model already allows you to branch off, connect arbitrary nodes and re-run only what's needed, but the visual ordering of the cells is still very inflexible.