docs: public static FeatureCollection pointsWithinPolygon(FeatureCollection points,
                                                        FeatureCollection polygons) {
      ArrayList<Feature> features = new ArrayList<>();
      for (int i = 0; i < polygons.features().size(); i++) {
        for (int j = 0; j < points.features().size(); j++) {
          Point point = (Point) points.features().get(j).geometry();
          boolean isInside
            = TurfJoins.inside(point, (Polygon) polygons.features().get(i).geometry());
          if (isInside) {
            features.add(Feature.fromGeometry(point));
          }
        }
      }
      return FeatureCollection.fromFeatures(features);
    }