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Like pg_tables, pg_views, and others, this view contains information about sequences in a way that is independent of the system catalog layout but more comprehensive than the information schema. To help implement the view, add a new internal function pg_sequence_last_value() to return the last value of a sequence. This is kept separate from pg_sequence_parameters() to separate querying run-time state from catalog-like information. Reviewed-by: Andreas Karlsson <andreas@proxel.se>