From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: Git --reference bug(?)
Date: Tue, 18 Oct 2011 23:25:08 -0700
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Cc: Michael Haggerty <mhagger@alum.mit.edu>,
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To: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano <gitster@pobox.com> writes:

>> 0397236d43e48e821cce5bbe6a80a1a56bb7cc3a	refs/tags/v2.6.12-rc3
>> a2755a80f40e5794ddc20e00f781af9d6320fafb	refs/tags/v2.6.12-rc3^{}
>> [...]
>>
>> I've never seen this format before; is this the remote protocol for
>> peeled refs or maybe the behavior of an old version of git?
>
> This should be very well documented and has been the output from fairly
> early days of ls-remote.

I take the first half back. The ls-remote documentation seems to have
bit-rotten quite a bit.

IIRC, we started doing this when we introduced auto-following of the tag
objects. Even update-server-info knows about it so it way predates smart
HTTP and is a fairly old and established behaviour.