def values(self) -> cabc.Iterable[V]:  # type: ignore[override]
        """Returns an iterator of the first value on every key's value list."""
        values: list[V]

        for values in super().values():  # type: ignore[assignment]
            yield values[0]
Returns an iterator of the first value on every key's value list.
src/werkzeug/datastructures/structures.py