in src/main/java/com/uber/h3core/H3Core.java [175:184]
public List<LatLng> cellToBoundary(long h3) {
double[] verts = new double[MAX_CELL_BNDRY_VERTS * 2];
int numVerts = h3Api.cellToBoundary(h3, verts);
List<LatLng> out = new ArrayList<>(numVerts);
for (int i = 0; i < numVerts; i++) {
LatLng coord = new LatLng(toDegrees(verts[i * 2]), toDegrees(verts[(i * 2) + 1]));
out.add(coord);
}
return out;
}