Junio C Hamano wrote:
> "git update-ref HEAD $commit" is accepted.  If @ is a synonym for
> HEAD, "git update-ref @ $commit" should work exactly the same way,
> but is it desirable?

>  Would we have $GIT_DIR/@ as the result?  How
> about "git symbolic-ref"?

Yes, it is a valid refname that can be overridden [*1*].

> Would @@{4} and HEAD@{4} be the same?

No.  Why should they?


*1*: In the current implementation, git update-ref fails.
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