Haskell Platform proposal: Add case-insensitive and Haskell 98/2010 compliance

[Mark Lentczner]

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)