static JCheckBoxMenuItem boolFieldMenuItem(O o, S field) {
  ret boolFieldMenuItem(o, field, null);
}

static JCheckBoxMenuItem boolFieldMenuItem(O o, S field, Runnable onSet) {
  S humanized = humanizeFormLabel(field);
  ret jCheckBoxMenuItem(humanized, isTrue(getOpt(o, field)), voidfunc(bool b) {
    set(o, field, b);
    callF(onSet);
  });
}

Began life as a copy of #1019442