echoing of stdin

Hugs currently turns off echoing of stdin before evaluation, and turns it on again afterwards. In partial compensation, getChar echoes chars to stdout (which is wierd if either stdin or stdout is redirected) but getContents doesn't. Is there any reason to retain this behaviour, rather than treating stdin like any other handle? For applications that don't want echoing, we could provide implementations of the System.IO functions hSetEcho, hGetEcho and hIsTerminalDevice.