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Upgrading from 15.4 to 16 gives you 11.2 months worth of changes and fixes (1 of them)

⇑ Configuration changes:

Config parameter:	Default value:
createrole_self_grant
debug_io_direct
debug_logical_replication_streaming	buffered
debug_parallel_query	off
enable_presorted_aggregate	on
gss_accept_delegation	off
icu_validation_level	warning
max_parallel_apply_workers_per_subscription	2
reserved_connections	0
scram_iterations	4096
send_abort_for_crash	off
send_abort_for_kill	off
vacuum_buffer_usage_limit	256

⇑ Upgrade to 16 released on 2023-09-14 - docs
- Add psql command \drg to show role membership details (Pavel Luzanov)
  The Member of output column has been removed from \du and \dg because this new command displays this informaion in more detail.