Issue with comma separated values (Carto)

Question

I'm using the official Carto library to parse CartoCSS:

cartocss = "#views { line-color: #7B00B4; line-width: 1; line-opacity: 0.7; line-dasharray: 4,2; }";

shader = new carto.RendererJS().render(cartocss),
style = shader.layers[0].getStyle({ property: 1 }, { zoom: 10 });

console.log({shader, style});

Here's a fiddle: http://jsfiddle.net/mz5xj67p/2/

The issue is the the value of dasharray. Although the style object has the correct value (4, 2) but when I try to retrieve it using getStyle method it just returns 4.

What am i missing?