Jakub Narębski <jna...@gmail.com> writes:

> I wonder how probable is situation where we save instruction sheet
> for interactive rebase, with shortened SHA-1, and during rebase
> shortened SHA-1 stops being unambiguous...

It is my understanding that the shortened ones are only for end-user
consumption.  The insn sheet internally uses fully expanded form for
this exact reason, and then abbreviated back at each step before the
updated one is presented to the end-user.  Uniqueness guarantee is
enforced with new objects created during each step taken into
account by doing it this way.

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