How to use the birdseye.cheap_repr.ReprHelper function in birdseye

def repr(self, x, level=None):
        if level is None:
            level = self.maxlevel
        for cls in inspect.getmro(correct_type(x)):
            if cls in supressed_classes:
                return basic_repr(x)[:-1] + ' (expensive repr suppressed)>'
            func = repr_registry.get(cls)
            if func:
                return func(x, ReprHelper(self, level, func))
        raise AssertionError