static JCheckBoxMenuItem boolFieldMenuItem(Container frame, O o, S field, Runnable onSet) {
  fS humanized = humanizeFormLabel(field);
  internalFrameTitlePopupMenu(frame/JInternalFrame, voidfunc(JPopupMenu menu) {
    menu.add(jCheckBoxMenuItem(humanized, isTrue(_getOpt(o, field)), voidfunc(bool b) {
      set(o, field, b);
      callF(onSet);
    }));
  });
}