Daniel-Constantin Mierla writes:
It proved that the issue was in the rpc module implementation related to handling of the optional specifier '*' when there were no more params available. I pushed some patches to both jsonrpcs and xmlrpc, but I could test only with jsonrpcs. Maybe you can give it a try with latest master and if all ok it needs to be backported as well.
I tried and with latest master ul.add works with or without the last two opt params.
-- Juha