> I discovered that
>many legacy GeoJSON files do not follow the rules and put polygon
>vertexes in CW order.

As far as I know, the Open Geospatial Consortium defines polygons with CCW 
order (and iCW inner rings) as "seen from top", and an iCW exterior ring (with 
CCW inner rings) as "seen from bottom".

That might explain the difference (if it's not just wrong by mistake).

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