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During a binary upgrade, all type OIDs are supposed to be assigned by pg_dump based on their values in the old cluster. But now that domains have arrays, there's nothing to base the arrays' type OIDs on, if we're upgrading from a pre-v11 cluster. Make pg_dump search for an unused type OID to use for this purpose. Per buildfarm. Discussion: https://postgr.es/m/E1dyLlE-0002gT-H5@gemulon.postgresql.org