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Re:Memcached turns 10 years old today by fosap on Tuesday May 21, 2013 @01:24PM (#5745182)
Git, or in general distributed VC.

Not obvious to implement. But the concept was obvious.

Re:Memcached turns 10 years old today by jlgreco on Tuesday May 21, 2013 @02:06PM (#5745494)
Even if DVC lacked the D, the concept of versions being a DAG was an incredibly important. A very big improvement to how classical CVS systems have developers think about history.