From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH 2/2] filter-branch.sh: support nearly proper tag name
 filtering
Date: Mon, 24 Mar 2008 07:49:46 -0700
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Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

> Hi,
>
> On Sun, 23 Mar 2008, Junio C Hamano wrote:
>
>> If you tell filter-branch to filter a branch A and a tag T, as the 
>> command is advertised to rewrite positive refs that were given from the 
>> command line, isn't it natural to expect that the command would attempt 
>> its best effort to rewrite such a tag object?
>
> The thing is: signed tags cannot be rewritten.

I know that, and you know I know that if you read what you responded again
;-)

And I think stripping of gpg signature part is a reasonable best effort
for the command, _when_ the user told a signed tag to be rewritten.