defaultShouldDisplayException hides exceptions from writing invalid characters to stdout.

[torgeirsh]

Consider this contrived program:

main = do
    e <- try $ putStrLn "ø"
    case e of
        Left (e :: SomeException) -> do
            print e
            print $ defaultShouldDisplayException e
        Right _ -> pure ()

The output when stdout has a character encoding that can represent "ø" is:

<stdout>: commitBuffer: invalid argument (invalid character)
False

The result is that warp quietly terminates requests that attempt to log a message that contains an invalid character, instead of printing out an error message. The relevant case in defaultShouldDisplayException's implementation seems to be:

    | Just (ioeGetErrorType -> et) <- fromException se
        , et == ResourceVanished || et == InvalidArgument = False

Is it necessary to hide all IO exceptions of type InvalidArgument, or could it be more specific about what to hide?