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https://github.com/saltstack/salt/blob/f4bea9a815ac8162c6d3220f29aa787a7cd2f5c2/salt/modules/iptables.py#L455
BEFORE
add_arg('-A', '--append', dest='append', action='append')
AFTER
add_arg('-A', '--append', dest='append', action='append', nargs='*')