"Document Data" is copied along with objects, why?

Hi guys, I use rs.SetDocumentData() to store info like Project Origin etc in my files.
But I see that if I copy an object from a file that has this data into a new document without this data, then this data is added too. It would be great if Rhino recognized this and asked me if I want to add it, ignore it or replace it

(Kind of the same way pasting a block with the same name would ask me what to do)