persistable asclass AbstractSSI extends AbstractHasHi15Color is G2Drawable, HasBounds, SizeInInts, StringIO, INumberOfPixels {
  abstract SSI toSSI aka render();
  
  void copyAbstractSSI(AbstractSSI dest) {
    dest.hi15color(hi15color);
  }
  
  double compressibility() {
    ret doubleRatio(numberOfPixels(), sizeInInts());
  }
  
  AbstractSSI reduceToInts(int ints) {
    null;
  }
}

Began life as a copy of #1035561