[Haskell-cafe] writeFile: commitBuffer: invalid argument (Illegal byte sequence)

Hi, In GHC 7.0.3 / Mac OS X when trying to: writeFile "someFile" "(Hoping You Have A iPhone When I Do This) Lol Sleep Is When You Close These ---> \55357\56384" I get: commitBuffer: invalid argument (Illegal byte sequence) The string I am trying to write can also be seen here: http://twitter.com/#!/search/Hoping%20You%20Have%20A%20iPhone%20When%20I%20Do%20This%20lang%3Aen<http://twitter.com/#%21/search/Hoping%20You%20Have%20A%20iPhone%20When%20I%20Do%20This%20lang%3Aen> It looks like 'writeFile' can not write unicode characters. Any workarounds? Thanks! Dmitri