Okay, my bad - case-insensitive *IS* doing the right thing for ByteString. (At least if you believe that treating ByteString as ISO-8859-1 encoded is the right thing!)
However, note that it is folding two different ways: In 0.4.0.2 and earlier, it was mapping Data.Char's toLower for all types except Text (where it was using Text's toCaseFold) >From 0.4.0.3 and on, it is using Text's toCaseFold for all types, except ByteString, where it uses it's own toLower function optimized for just ISO-8859-1. - Mark
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