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It would appear to me that multiple commits in a branch can have the same generation number (see the diagram in http://www.spinics.net/lists/git/msg161165.html ). So unless your history is linear, using generation numbers in human-to-human communication may get confusing really fast.

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In that diagram, I see 2 sequences of commits (two branches).

The 'original branch' (e.g. "unstable") goes: 0,1,2,5,6

Then there is a topic branch (e.g. "add-frob"), which goes: (0,1),2,3,4,(5). Note that I consider the the 'add-frob' branch ended at the merge commit, so there is no "revno 6 of 'add-frob').

I don't consider that merging 'add-frob' back into unstable means that "revno 2 in unstable" could mean commit D - I would call commit D "revno 2 in add-frob".

Does that system work?

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