public int getPointLabelGridLimitAtZoom(int zoom) {
      return ZoomFunction.applyAsIntOrElse(labelGridLimit, zoom, DEFAULT_LABEL_GRID_LIMIT);
    }
Returns the maximum number of lowest-sort-key points to include in the output vector tile in each square of a
grid with size {@link #getPointLabelGridPixelSizeAtZoom(int)}.
planetiler-core/src/main/java/com/onthegomap/planetiler/FeatureCollector.java