Created a new Rules object based on the provided dict of rules.

def _set_rules(self, rules: dict, overwrite=True):
        """Created a new Rules object based on the provided dict of rules."""

        if not isinstance(rules, dict):
            raise TypeError('rules must be an instance of dict or Rules,'
                            'got %r instead' % type(rules))

        if overwrite:
            self.rules = Rules(rules, self.default_rule)
        else:
            self.rules.update(rules)