Is there a fluent transition possibility for animation font-size in Raphael JS?

So far it seems like it is not fluent, but choppy. E.g. if you have one state attribute with font-size: 14 and want to animate to state with font-size: 16, the transition doesn't look smooth.

It jumps in 2 steps. First change to 15 and then to 16px.

Can it be forced to look more smooth?

I am using Firefox 14 for testing.

My current code:

    var fillerText = {
        "fill" : "#00738f",
        "font-size": 14,
        "font-family": "Arial, Helvetica, sans-serif"
        }
    var fillerTextHover = {
        "fill" : "#00738f",
        "font-size": 16,
        "font-family": "Arial, Helvetica, sans-serif",
        "cursor": "pointer"
        }

text.hover(function () {
       text.animate(fillerTextHover, 500);
               },
  function () {
       text.animate(fillerText, 500);
          }
);