private static void reverseInPlace(LongArrayList orig) {
    for (int i = 0, j = orig.size() - 1; i < j; i++, j--) {
      long temp = orig.get(i);
      orig.set(i, orig.get(j));
      orig.set(j, temp);
    }
  }
Builds a multipolygon from linestrings containing the IDs of nodes in edge segments and a node ID location
provider.
<p>
Attempts to close rings where endpoints are within {@code minGap} units apart.

@param rings     edge segment node ID sequences
@param nodeCache node location provider
@param osmId     ID of this multipolygon
@param minGap    the minimum units apart to close a linestring
@return The new multipolygon
@throws GeometryException if building the polygon fails
planetiler-core/src/main/java/com/onthegomap/planetiler/reader/osm/OsmMultipolygon.java