[python-dateutil] should `_rrulestr`'s typing have an overload based on `forceset` / `compatible`?

[lev-blit]

reading the implementation of _rrulestr.__call__ (internally calling _rrulestr._parse_rfc), it seems that when forceset=True (or compatible=True, since it sets forceset to True), the return type is always rrulesetand notrrule`, which is not currently reflected in the type stubs

[srittau]

I haven't looked at this, but adding appropriate overloads sounds like a good improvement. PR welcome!