Allow to use tag values ​​with letters from non-Latin alphabet without quotes

[deevroman]

Now you can write:

nwr[name~test];
out;

But it doesn't work for non-latin characters

nwr[name~тест];
out;

I understand that special characters may be reserved (for example, ], , and spaces are currently used nwr[name~test, i];). But it is unlikely that the letters of such alphabet will be used as special characters. So why not allow them to be used without quotes?