From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Riesen <raa.lkml@gmail.com>
Subject: Re: [PATCH] checkout -d: explicitly detach HEAD even when switching to the tip of a branch
Date: Thu, 29 Mar 2007 19:10:24 +0200
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Cc: Junio C Hamano <junkio@cox.net>, git@vger.kernel.org
To: Xavier Maillard <zedek@gnu.org>
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Xavier Maillard, Thu, Mar 29, 2007 12:44:42 +0200:
>    This allows you to detach your HEAD and place it at such a
> 
>        $ git checkout -d master
> 
> Hum, excuse my ignorance, but can you explain what exactly could
> be a use case of this ?

A throw-away or an experimental work. A commit importer which cares
about the branch it commits on: to update the branch reference only
when it has reached a stable state.