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use overload
    '""'     => sub { shift->{'name_lc'} },
...
}

sub name_lc { shift->{'name_lc'} }

%Time    Sec.     #calls   sec/call  F  name
14.67   55.4872  2174052   0.000026     <anon>:...5.8.2/Class/DBI/Colu
+mn.pm:37
 9.55   36.1474  2178574   0.000017     Class::DBI::Column::name_lc