[Question] Is "REGISTRY" meant to be a decorator for "Collectors"?

Browsing through the code I've found a function called write_to_textfile in the exposition module. This function signature looks like this:

def write_to_textfile(path, registry):
    """Write metrics to the given path.
    pass

If you read the implementation of the function, turns out the expectation is not really a registry but instead anything that implements (something like an interface) the .collect() method.

Is that by design?

If so, would it be welcomed the addition of type hints throughout the code? I would be happy to add them and create a PR.

Comienza en el módulo de exposición, en write_to_textfile, y compara su parámetro registry con el comportamiento de .collect() descrito en el issue. Antes de hacer cambios, determina si se desean anotaciones de tipos en todo el código base de Python; hacerlo requeriría acordar el alcance y contar con una decisión de los maintainers.