CDB_TransformToWebmercator: do not clip geoms within valid bounds
CDB_TransformToWebmercator: do not clip geoms within valid bounds

This means a speedup of 10x against a multipolygon composed by
631 polygons with a total of 64823 vertices and representing
North America (from the "continents" dataset).

jmwenda/nationmaps,jmwenda/nationmaps,datapolitan/cartodb20,jmwenda/nationmaps,datapolitan/cartodb20,datapolitan/cartodb20,jmwenda/nationmaps,datapolitan/cartodb20