The original logic why it doesn't work for the current year is because it was designed to render copyright foo beginyear - endyear so it would have been strange if both begin and end year was the same. I've fixed it for the next version so it will be possible to put the current year for the begin year and it will just leave out the - endyear part and show copyright foo beginyear if beginyear equals the current year.
Best,
Joe