Andrew Dunstan <andrew@dunslane.net> writes:
> Yes, this appears to be a bug, not related to encoding etc. Maybe we
> should be calling func_signature_string in generating this error.
Can't, because you don't have an Oid array for the types.
TypeNameToString is the correct thing --- I'm considering inventing
"TypeNameListToString" in order to make generating the message simple.
regards, tom lane