I didn’t describe it correctly. I see people approaching the roundabout with their left signal on, leave it on until they take the 3rd exit. I’ll also see approaching with their eight signal on and take the 1st exit. The intersection used to be a standard perpendicular intersection with traffic lights.

It sounds as if you’re saying to signal left on approach indicating a merge, then signal right to indicate an exit from the circle. I can’t say that I’ve ever seen that in action.