Memory leak in DataSnap Server (in procedures with parameters OUT)

I detected a memory leak in datasnap server.
This occurs when the procedure or function has string parameters (OUT)
Example: 
procedure TServerMethods1.GetStringOUT(out Value: string);
begin
Value := 'HELLO WORLD';
end;
I need suggestions how resolve this problem. 
In the link I post the proyect demo 
https://www.wetransfer.com/downloads/82acc9b469d7446000eee697a91a834220160503154708/c5e922390c769e7d06a026bdc7551c0d20160503154708/837926
Thanks