Re: Proposal: System.Environment.getEnv should return Maybe

Another thing that jumped out at me when I looked at the source was that it decodes based on getFileSystemEncoding. Given all the brouhaha about FilePaths, maybe I can attach a rider to add a 'lookupEnvBytes :: ByteString -> IO (Maybe ByteString)' and 'getEnvironmentBytes :: IO [(ByteString, ByteString)]', since I'm pretty sure there's no defined encoding for env vars on unix. I hesitate to suggest it because I don't have an immediate use for it myself, but given that we decided we wanted RawFilePath (did we? or did that never go into the stdlib?), maybe we can preemptively avoid the same debate here.