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> I can actually think of a fourth solution, although it will be probably
> be received as rather hack-ish.  You can add two new functions,
> string.upgrade and string.downgrade, which marks a string as UTF-8 or
> "non-UTF-8".

This is in fact very similar to the way Perl handles Unicode [1]
And to my experience, it works quite well.
Also, if Lua supports UTF-8, it will have to accept UTF-8 filenames on Windows.
Jérôme Vuarand has written a patch for this [2], perhaps it will be
included in vanilla Lua one day. ?