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This should of course be just "PG_ARGISNULL()". Also reorder a couple of paras to make the discussion of PG_ARGISNULL less disjointed. Back-patch to v10 where the error was introduced. Laurenz Albe and Tom Lane, per an anonymous docs comment Discussion: https://postgr.es/m/158399487096.5708.10696365251766477013@wrigleys.postgresql.org