Jeff King <> writes:

> So yeah, we would want to put the pack trailer sha1 into the
> supplementary index file, and check that it matches when we open it.
> It's a slight annoyance, but it's O(1).

Yes.  If I am not mistaken, that is exactly how an .idx file makes
sure that it describes the matching .pack file (it has packfile
checksum in its trailer).  Otherwise you can repack the same set of
objects into a new .pack file and make existing .idx very confused.

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