Arguments passed to an @exposed method as positional and keyword are not refused

[sveneberth]

I just found out you can provide the same argument twice; as positional and keyword. But the positional takes always(?) precedence over the keyword.
I mean this behavior is kind of okay, if it's well documented, but it isn't. And this could cause confisions.
I would rather raise an error if you provide the argument twice -- like the python interpreter would do it.

Here a small example:

@exposed
def demo(
    self,
    arg1: int = 1,
    arg2: int = 2,
):
    return {"arg1": arg1, "arg2": arg2}

Path	response
/demo	{'arg1': 1, 'arg2': 2}
/demo/7	{'arg1': 7, 'arg2': 2}
/demo?arg1=8	{'arg1': 8, 'arg2': 2}
/demo/7?arg1=8	{'arg1': 7, 'arg2': 2}