Sounds reasonable. Not being able to undo a checkin does not seem like a problem to me, as checkins don't usually bring about ooops moments, if ever. Also, imm

Sounds reasonable. Not being able to undo a checkin does not seem like a problem to me, as checkins don't usually bring about ooops moments, if ever. Also, immutable history makes a lot of sense, not just for SCM, but for RDBMS, too. So we see quite a few people are now going with the append-only databases.