srecord noeq G22HolePaths(IImageRegion region) {
  // paths are not closed (first pixel not added again at the end)
  
  L<OnePathWithOrigin> get() {
    L<PtBuffer> outlines = region.createdWithDiagonals()
      ? g22_allBorderTraces_withDiagonals(region)
      : g22_allBorderTraces(region);
    
    ret map(dropFirst(outlines),
      points -> new OnePathWithOrigin(points, false));
  }
}