Jim Jones <jim(dot)jones(at)uni-muenster(dot)de> writes:
> That's indeed a much larger problem. Calling it from a session silently
> delivers a "wrong" result --- I was expecting an error.
Yeah, me too. See
https://www.postgresql.org/message-id/2736425.1758475979%40sss.pgh.pa.us
regards, tom lane