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I think the `re.compile(r'^-.+$')` behavior could be better achieved by inserting a simple test in `_parse_optional` before the `_negative_number_matcher` test.
 # behave more like optparse even if the argument looks like a option
 if self.args_default_to_positional:
 return None
In effect, if the string does not match an action string, say it is a positional.
Making this patch to argparse.py is simple. How much to test it, and how document it requires more thought.