NULL pg_database.datacl

Does that mean nobody can connect to this database?

I guess SUPERUSER and/or its datDBA can?

What does a NULL AclItem[] mean exactly?

(BTW, datallowconn is true)

Thanks, --DD

ddb=> select datname, datdba::regrole::text from pg_database where datacl is null;
 datname | datdba
---------+--------
 qadb    | qauser
(1 row)

PS: Was also surprised with  #42883: ERROR:  no binary output function available for type aclitem

  Thankfully datacl::text[] works fine in binary mode.