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If a database name contained a '=' character, pg_dumpall failed. The problem was in the way pg_dumpall passes the database name to pg_dump on the command line. If it contained a '=' character, pg_dump would interpret it as a libpq connection string instead of a plain database name. To fix, pass the database name to pg_dump as a connection string, "dbname=foo", with the database name escaped if necessary. Back-patch to all supported branches.