My proposed fix is changing Tags.php line 217 from
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if (!in_array($tagging_name, $current_tags)) {
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if(!in_array(strtolower($tagging_name), array_map('strtolower', $current_tags))){
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array_search($tagging_name, $current_tags));
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array_search(strtolower($tagging_name), array_map('strtolower', $current_tags)));
Cheers!
-Eric
(sorry I wasn't sure if this should go in the Proposals or the Bugs section... )