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attempted using the most recent serial number from the
*txn_manager*; it is the caller's responsibility to ensure there
are no write transactions active that could invalidate the
retrieved serial. If a serial cannot be determined, AXFR will be
forced. Other integer values are the starting serial to use.
``None`` forces an AXFR.
Please see the documentation for :py:func:`dns.message.make_query` and
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to this function.
Returns a `(query, serial)` tuple.
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