I think perhaps you're misunderstanding the role of the comma (,). In a message box (not in a line object!), it serves to separate individual messages. So if (in a message box!) you have "10., 27. 3000" and you trigger that message box, it sends out the message "float 10." followed immediately by the message "list 27. 3000". The line object understands int, float, and list messages, but does not have any idea what to do with a comma.