Re: [PATCH 1/6] Allow pack header preprocessing before unpack-objects/index-pack.

Rather nicely done.  I see upto 2/6 are identical to what has
sitting in "pu" for the past few days, modulo some indentation?

I wonder how much testing has this series seen, by the way.

Also, I wonder what happens after 5/6 errors out.  It dies and
the caller (typically receive-pack) reports it back, which would
fail the push (and does not update the refs).  Retrying in such
a case would probably use the same set of refs on both ends,
resulting in exactly the same pack...