data-value not working with "bar"

[gamebak]

Hey, I wanted to try out the latest data-value attribute, but I can't figure why it isn't working: My attempts:

<span class="bar" data-value="9,8,9,10,9,9,7,8,7,9">9,8,9,10,9,9,7,8,7,9</span>
<span class="bar" data-value="123">9,8,9,10,9,9,7,8,7,9</span>

JS part

$(".bar").peity("bar", {
        height: 36,
        fill: ['rgba(100,100,100,0.85)'],
        width: 65,
        padding: 0.2
    });

Not sure what I'm not doing ok, can you give me an example when you have time?