Non-ascii characters in selectors

I tried to validate the following CSS:

@charset "UTF-8";
..баба {
	font-weight: bold;
}

and got the following error:

Parse Error  .1010 { font-weight: bold; }

I tried with or without the @charset instruction.

The CSS grammar says it's OK to use unicode in selectors:

"http://www.w3.org/TR/2005/WD-css3-selectors-20051215/#grammar

Happy hacking,
Nikolay.