srecord noeq G22MeshScrambler(G22Mesh mesh) {
  delegate Anchor, Curve to G22Mesh.
  
  G22Mesh scrambledMesh;
  new Map<Anchor> anchorMap;
  
  G22Mesh get() {
    scrambledMesh = new G22Mesh;
    
    // copy anchors in shuffled order
    
    for (a1 : shuffled(mesh.anchors())) {
      var a2 = scrambledMesh.newAnchor(a1.pt);
      anchorMap.put(a1, a2);
    }
    
    // copy curves (optionally flipping them)
    
    for (c1 : shuffled(mesh.curves())) {
      bool flip = flipCoin();
      var path = flip ? c1.path.reversed() : c1.path;
      scrambledMesh.addCurve(new Curve(
        anchorMap.get(c1.anchor(flip)),
        anchorMap.get(c1.anchor(!flip)),
        path
      ));
    }
    
    ret scrambledMesh;
  }
}