How to annotate types of multiple return values?

How do I use type hints to annotate a function that returns an Iterable that always yields two values: a bool and a str? The hint Tuple[bool, str] is close, except that it limits the return value type to a tuple, not a generator or other type of iterable.

I’m mostly curious because I would like to annotate a function foo() that is used to return multiple values like this:

always_a_bool, always_a_str = foo()

Usually functions like foo() do something like return a, b (which returns a tuple), but I would like the type hint to be flexible enough to replace the returned tuple with a generator or list or something else.

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