static LiveValue dm_fieldLiveValue(S fieldName) {
  ret dm_fieldLiveValue(dm_current_mandatory(), fieldName());
}

static LiveValue dm_fieldLiveValue(final DynModule module, fS fieldName) {
  lock module.lock;
  Class type = getFieldType(module, fieldName);
  final SimpleLiveValue value = new(type, get(module, fieldName));
  module.onChange(r {
    value.set(get(module, fieldName));
  });
  ret value;
}