Re: [PATCH v2] fetch-pack: support negotiation tip whitelist

This seems like a pretty difficult to use feature, requiring that I
provide the actual OIDs.  I think a much better UI would probably be to
accept a number of different things ranging from exact OIDs to actual
ref names or even better, allowing for ref-patterns which include globs.
That way I can do the following:
  
  git fetch --negotiation-tip=refs/remotes/my-remote/* my-remote

in order to easily limit the tips to all the refs I have from that
particular remote.

Actual ref names are already supported - it uses the same DWIM as
others. As for globs, I thought of supporting both DWIM objects and the
LHS of refspecs, but (1) it might be strange to support master and
refs/heads/* but not heads/*, and (2) I can't think of anywhere in Git
where you can provide either one - it's either SHA-1 and DWIM name, or
SHA-1 and refspec, but not all three.