static <A> LiveValue<A> dm_transientCalculatedLiveValue(DynModule mod default dm_current_mandatory(), Class type, IF0<A> calc) {
  lock mod.lock;
  SimpleLiveValue value = new(type, calc!);
  mod.onFieldChange(voidfunc(S field) { value.set(calc!) });
  ret value;
}

static LiveValue<O> dm_transientCalculatedLiveValue(IF0<O> calc) {
  ret dm_transientCalculatedLiveValue(O, calc);
}