// NotifyingList is our new go-to way to wrap a list
// with additional functions.
persistable sclass VectorSSIList extends NotifyingList<VectorSSI> is ByteIO {
  *() { init(); }
  *(Cl<? extends AbstractSSI> l) { initAndAddAll(vectorize(l)); }
  
  L<VectorSSI> vectorize(Cl<? extends AbstractSSI> l) {
    ret map toVectorSSI(l);
  }
  
  BufferedImage render(WidthAndHeight size) {
    ret renderAll(this, size);
  }
  
  BufferedImage render(BufferedImage canvas) {
    ret renderAll(this, canvas);
  }
  
  BufferedImage renderOutlines(WidthAndHeight size) {
    ret toSSIlist().renderOutlines(size);
  }
  
  SSIList toSSIList() {
    ret new SSIList(map(this, -> .toSSI));
  }
}