Re: [Haskell-cafe] Why so many strings in Network.URI, System.Posix and similar libraries?

Jason Dusek wrote:

...

:info System.Posix.Env.getEnvironment System.Posix.Env.getEnvironment :: IO [(String, String)] -- Defined in System.Posix.Env

But there is no law that environment variables must be made of characters:

The recent ghc release provides System.Posix.Env.ByteString.getEnvironment :: IO [(ByteString, ByteString)] -- see shy jo