About addressing this - does anyone know why you can't change a vote on HN? I've had several times where I meant to downvote specifically and upvoted instead by

About addressing this - does anyone know why you can't change a vote on HN? I've had several times where I meant to downvote specifically and upvoted instead by mistake; the buttons are very close together especially on a mobile device, but even on my desktop my finger has slipped.