Opinion of darcs and/or pijul? I like them, except for the fact that they're in Haskell and Rust respectively.
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I hadn't even heard about Darcs or Pijul until now, so I'm just going off of what their Web sites say. Both of them seem quite interesting. The ability to undo a single change, without affecting any of the history after that point, sounds like it would be very useful. But it also sounds like a promise that'd come with some unmentioned caveats. I suppose I'll just have to see for myself.