Support ArgumentDefaultsHelpFormatter by allowing extra calls to default_factory#70

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cdleonard wants to merge 7 commits intomivade:mainfrom

cdleonard:feature/argparse-default

Commits on Jun 16, 2025

ArgumentParser.parse_args: just call super().parse_args and cast the result
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test_default_factory_2: relax to allow multiple calls to default_factory
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Initialize an argparse.Namespace before parsing which fills in all fields with dataclass-level defaults
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argparse_dataclass: initialize action default
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test_argumentparser: Test ArgumentDefaultsHelpFormatter
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README.rst: document ArgumentDefaultsHelpFormatter support and default_factory treatment
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CHANGELOG.md: document ArgumentDefaultsHelpFormatter support and default_factory behavior change
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