/*
Typical way to implement (from WidthAndHeightImpl):
ifclass ByteHead
  public void readWrite(ByteHead head) {
    head.exchangeInt(l0 width, w -> width = w);
    head.exchangeInt(l0 height, h -> height = h);
  }
endif
*/

interface ByteIO {
  replace SomethingHead with ByteHead.
  
  !include early #1035662 // ByteIO/BitIO helpers
}