Looks like the "svnadmin dump" merginfo precautions are also triggered in "verify" mode, which isn't desirable:
$ svnadmin verify -r12920:HEAD svn-repo_cut-29-09-2010 * Verified revision 12920. * Verified revision 12921. * Verified revision 12922. * Verified revision 12923. * Verified revision 12924. * Verified revision 12925. * Verified revision 12926. * Verified revision 12927. * Verified revision 12928. * Verified revision 12929. WARNING: Mergeinfo referencing revision(s) prior to the oldest dumped revision (12920). WARNING: Loading this dump may result in invalid mergeinfo. * Verified revision 12930. * Verified revision 12931. [...] - Julian
