For highway=pedestrian, at platforms and many other things we allow to add area=yes to a feature to turn a circular way (ring) to a circular area (filled area, polygon). If - and that's in fact more or less the result of the discussions we had in the last days - the difference between mini roundabouts and roundabouts is the traversability of the center part, I would say, mapping a mini roundabout as a way would in theory be sufficient without area=yes, because area=yes would be implied. On the other hand I would propose to add area=yes to avoid confusion both at data consumer side as well as on mapper side (yes, they MEANT it to be a mini roundabout, I guess, because they knew it's an area without obstacle in the middle).
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