A typeclass for byte operations?

Hey guys, At work we have many and varied needs to do bytewise operations on Haskell data. Things like: toBigEndian rotateBytes etc. Has anyone thought about: * A "Bytes" class, like the Bits class? Providing standard operations on values treated as bytes? * An Endian class, a la fromIntegral, for flipping bytes into a particular endianness. -- Don