paul j3 added the comment:

Changing the test from

    if argument_values is not action.default:

to 

    if argument_values is not action.default and \
        (action.default is None or argument_values != action.default):

makes the behavior more consistent.  Strings and large ints behave like small 
ints, matching the default and not counting as "present"

Simply using `argument_values != action.default` was not sufficient, since it 
raised errors in existing test cases (such as ones involving Nones).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18943>
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