Back in 2008 or so, GHC changed the behavior of unicode characters in the parser that parse as OtherLetter to make them parse as lower case so that languages like Japanese that lack case could be used in identifier names:
In a recent thread on reddit Lennart Augustsson pointed out that this change
was never backported to Haskell'.
Would it make sense to adopt this change in the language standard?
Marlow when he made the change to GHC noted he was considering bringing it up to Haskell' but here we are 6 years later.
-Edward Kmett