Perforce

Wow. I can almost hear the punch card reader in the background. Talk about an obsolete mindset. If I'm editing file X, do I really want to know whether somebody, somewhere, working on some idea that I have no idea about, is trying out something that also somehow involves file X, something that ultimately may never see the light of day? No.

If we get to the point of merging, I think about it then (if necessary).