[issue38843] Document argparse behaviour when custom namespace object already has the field set

[Raymond Hettinger]

Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Ivan, you don't need to specify default values to have typing.  This will 
suffice:

    class CliArgs(object):
        foo: Optional[str]
        bar: int
        baz: float

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