I asked before, but didn't get an answer. Darcs is criticized for lack of soundness and potential exponential merge complexity -- which I'm not sure I've actua

I asked before, but didn't get an answer. Darcs is criticized for lack of soundness and potential exponential merge complexity -- which I'm not sure I've actually run into -- but that's Darcs2. I haven't actually followed along, but I thought the development Darcs3 is an answer. This may not be the place to ask, but can anyone compare the new Pijul and Darcs3?