Fixing rebase rather than avoiding it

[Stephen J. Turnbull]

Matthew D. Fuller writes:

 > I don't see how.  [Rebasing a branch onto the same commit is]
 > barely even _meaningful_.  You're creating a new rev with the same
 > contents, committer, timestamp, log, and parents as an existing
 > rev.

Ah, I was thinking about the rest of my post, and forgot that you were
talking about the trivial case.  Sorry.  It's completely well-defined
in git, as you point out:

 > If you did it in git, I'd think even the id would be the same,
 > since all the info it's based on is the same.