In the IBO40.HLP I found

// 53bit integer based numeric objects, [Now removed]
IB_NOROUNDERR = 'NOROUNDERR';
IB_CURR = 'CURR';
IB_COMP = 'COMP';

That means the option 'NOROUNDERR' is no longer valid/used ?

Is it no longer needed cause of the 64bit integer in FB1.0?

How did this option worked?

Best regards - Ulrich