[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.

Inizia nel modulo di esposizione, in write_to_textfile, e confronta il suo parametro registry con il comportamento di .collect() descritto nell’issue. Prima di apportare modifiche, determina se le annotazioni di tipo sono desiderate nell’intera codebase Python; farlo richiederebbe concordare l’ambito e una decisione dei maintainer.