calculate areas and lengths of featureCollections as well #51
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in some special case situations (e.g. clipping of a polygon geometry with touching inner rings), or for relation types other than _multipolygon_s,
Geo
returned0.0
for length and area, even though the respective geometry collection might contain polygons or linestrings. This implementation recursively iterates through the geometry collection's sub-geometries and returns the sum of its areas/lenghts.