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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<http://bugs.python.org/issue18943>
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