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The pg_class fields relpages, relallvisible, and relallfrozen are stored as int32 in the catalog but block numbers are internally of type uint32. This all works correctly because the values are implicitly converted back and forth according to C conversion rules. But this was apparently never explicitly documented, so add this. Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/db993f34-e3e1-4e6e-85c3-4f248d2ff29b%40eisentraut.org