[Haskell-beginners] How do you show a Data.ByteArray?

Prelude Data.ByteArray> c = Data.ByteArray.zero 20 Prelude Data.ByteArray> :type c c :: ByteArray ba => ba Prelude Data.ByteArray> c <interactive>:38:1: error: • Ambiguous type variable ‘a0’ arising from a use of ‘print’ Uhm... Prelude Data.ByteArray> index c 3 <interactive>:39:1: error: • Ambiguous type variable ‘a0’ arising from a use of ‘index’ I can't print a byte?