sets the UTF-8 input/output flag. This flag is set automatically
depending on your locale setting, and is used to determine whether
communication with the user (keyboard and terminal) should be UTF-8
encoded. Normally you would not alter this flag, but sometimes
may make the wrong guess (e.g., when you are remotely connected).
If you invoke
UTF8IO with no arguments, it will toggle the flag.
If you specify 0 or 1, the flag will be set to false or true,
respectively. An ‘@’ will appear on the status bar if the flag is