Traffic circles and rotaries are not modern roundabouts. If any of the entry lanes has a stop sign, it’s not a modern roundabout. If you could play a game of football in the center landscaped area, it’s not a modern roundabout. If the circular roadway has a stop sign, yield sign or signal, it’s not a modern roundabout. If you don’t have to slow down to enter it, it’s not a modern roundabout. If you have to change lanes in the circular roadway to exit, it’s not a modern roundabout. If you can easily drive faster than 20 mph in the circular roadway, it’s not a modern roundabout. If it has a park for pedestrians, or a building, in the middle, it’s not a modern roundabout.

This is pretty common in France. Every major city has like dozens of these kinds of intersections (e.g. behind the Trocadero, around the Arc de Triomphe, etc)

My recollection is that the roundabouts in Paris are free for alls (a whole different kind of crazy, but it seems to work). I checked the satellite images of the circle around the arc de triomphe and it seems to be as I remember. There may be lights regulating entry into the circle, but the lanes aren't divided. And if I recall correctly pedestrians access the middle via underground walkway.

I just checked via Google street view and it confirms my memory.