jquery ui spinner strings

Question

Can anyone suggest analog of spinner from jQuery UI, that has ability to display strings instead of specific values? In my example I have two widgets, spinner and select, where select shows string "Foobar" when values is -1, but I want to use spinner to not to bound values to ones from list. http://jsfiddle.net/andrewboltachev/qk6bn/

I want actual plugin to have options like these:

$('#myspinner').spinner({
    'min': -1,
    'values_to_text': function(x) {
        if (x === -1) return 'FooBar';
        return x;
    }
});