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I agree — not the best example, here is a better one explaining what behavior should not exist:
>>> parser = argparse.ArgumentParser()
>>> parser.add_argument('foobar', action='store')
>>> parser.add_argument('foobar2', nargs='?')
>>> parser.add_argument('foobar3', nargs='*')
>>> print parser.parse_args(['foo', '--', 'foo3', 'foo3'])
Namespace(foobar='foo', foobar2='foo3', foobar3=['foo3'])
I would expect both foo3 to be part of foobar3. This does not happen because of foobar2 argument eating zero or one argument. Arguments after -- should be left unparsed as such behavior was in optparse.