v-filter which will only update
authors and committers, missing taggers.</p>
</li>
<li>
<p>If the user provides a --tag-name-filter that maps multiple tags to
the same name, no warning or error is provided; git-filter-branch simply
overwrites each tag in some undocumented pre-defined order resulting in
only one tag at the end.  (A git-filter-branch regression test requires
this surprising behavior.)</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Also, the poor performance of git-filter-branch often leads