Nodes converting from smooth to cusp on export

I've never noticed this before but when I export an object as an EPS, SVG or PDF all the smooth nodes are converted to cusp nodes. This hasn't been an issue for me in the past because all my exports are final artwork, but in this case I want my customer to be able to manipulate the image and retain the smooth curves instead of having to reconvert them all. Is there a setting I'm missing on the export that would keep the smooth nodes smooth?