[Tile-serving] [osm2pgsql] Wrong polygon generation (overfitting) with closed ways (#304)

[Paul Norman]

> I'm not sure if this is similar or not, but while http://www.openstreetmap.org/relation/4672722 existed the roundabout consisting of ways such as http://www.openstreetmap.org/way/33181751 didn't render on OSM-carto, humanitarian or my local database. In my case it was due to the constituent way not being in the database:

What you describe is correct behavior - the way gets converted to a POLYGON instead of a LINESTRING, which is the expected behavior for multipolygons.

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https://github.com/openstreetmap/osm2pgsql/issues/304#issuecomment-82785329
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