TypeError: object of type 'ellipsis' has no len()

[pseudo-rnd-thoughts]

Describe the bug
I am part of the development team on OpenAI/gym which we are slowly adding type hinting.
Recently I found this repo and thought it would be a great way of testing the type hinting is correct
However, in part of the code we get the following error with typeguard

To Reproduce

from typing import Callable

from typeguard import typechecked

@typechecked
def fn_generator(name: str) -> Callable[..., object]:
    # The actual code we want to run
    # >>> mod_name, attr_name = name.split(":")
    # >>> mod = importlib.import_module(mod_name)
    # >>> fn = getattr(mod, attr_name)
    # >>> return fn

    # Example code for testing
    def f(**kwargs):
        return 1
    return f

fn_generator("a")

Expected behavior
From my understanding, ... is the correct way of type hinting a callable with unknown args and kwargs
python/mypy#5876

Is this correct? Or is there alternative way that typeguard expects