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

static SimpleLiveValue 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 {
    ifdef dm_fieldLiveValue_debug
      print("dm_fieldLiveValue: setting " + fieldName);
    endifdef
    O o = get(module, fieldName);
    ifdef dm_fieldLiveValue_debug
      print("dm_fieldLiveValue: setting " + fieldName + " = " + o);
    endifdef
    value.set(o);
    ifdef dm_fieldLiveValue_debug
      print("dm_fieldLiveValue: setting " + fieldName + " done");
      printStackTrace();
    endifdef
  });
  value.onChange(r {
    ifdef dm_fieldLiveValue_debug
      print("dm_fieldLiveValue: setting 2 " + fieldName + " = " + value!);
    endifdef
    module.setField(fieldName, value!);
    ifdef dm_fieldLiveValue_debug
      print("dm_fieldLiveValue: setting 2 " + fieldName + " done");
    endifdef
  });
  ret value;
}

Began life as a copy of #1015971