er-repo manual page for more
details.</p>
</li>
</ul>
</div>
</li>
<li>
<p>Annotated tags can be accidentally converted to lightweight tags, due
to either of two issues:</p>
<div class="ulist">
<ul>
<li>
<p>Someone can do a history rewrite, realize they messed up, restore
from the backups in refs/original/, and then redo their
git-filter-branch command.  (The backup in refs/original/ is not a
real backup; it dereferences tags first.)</p>
</li>
<li>
<p>Running git-filter-branch with either --tags or --all in