I very much like it.

But could you be a bit more explicit than application/x-git-refs magic?  I
suspect very strongly that clueless server operators would advertise the
type on repositories statically hosted there, and would defeat the point
of your patch.

We are not changing update-server-info so if we can find a place we can
use to hide the "magic", it would be a much more robust.

Perhaps "#" comment line in info/refs that is ignored on the reading side
but update-server-info never generates on its own?

Or perhaps sort the output differently from how update-server-info
produces its output, so that older client would not care but the magic
aware client can notice?



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