JavaScript and Unicode value busted.

I am trying to set page labels with JavaScript and put a Cyrillic Capital Letter De as the prefix character. It's not working. Here is what I get when I try to do this programatically in the console.

setPageLabels(63, ["D", "\u0414", 14]);
console.println(getPageLabel(63));
.14
true

I get a period character. I can insert the character by pasting into the Page Numbering dialog and it works.

I thought Acrobat was very unicode compliant.

If I choose a character such as u0041 which is a capital letter A that works.