Robert Hass committed ddb17e387aa28d61521227377b00f997756b8a27, which changed how EXPLAIN indicates fractional rows. That's cool but I have to see that change on sources because it's not explained on DOCs.
One can understand that cost=4.36, that actual time=0.009, but what means rows=10.43 ? Costs and Time having decimals are fine but what is a row and a half ?
So, I don't know exactly how to explain this change but I think it would be good to have a new paragraph on [1] and explain that now when nloops > 1, we now display two digits after the decimal point, rather than none.