cliff.command.Command.__init__() receives different type of app_args

The function __init__() of subcommand classes that override cliff.command.Command receive different type of app_args.
app_args will be an argparse.Namespace object when the classes are instantiated from cliff.app.App.run_subcommand().
On the other hand, app_args will be a list object when the classes are instantiated from cliff.help.HelpCommand.

For example, ...

class Subcommand(Command):

    def __init__(self, app, app_args):
        super(Subcommand, self).__init__(app, app_args)

        # When the help command is called,
        # the type of 'app_args' will be a list.
        if isinstance(app_args, argparse.Namespace):
            self.hogehoge = app_args.hogehoge
            ....

I'd like to unify this inconsistent behavior.