get_original_bases

Return the class's "original" bases prior to modification by `__mro_entries__`.

Examples::

    from typing import TypeVar, Generic, NamedTuple, TypedDict

    T = TypeVar("T")
    class Foo(Generic[T]): ...
    class Bar(Foo[int], float): ...
    class Baz(list[str]): ...
    Eggs = NamedTuple("Eggs", [("a", int), ("b", str)])
    Spam = TypedDict("Spam", {"a": int, "b": str})

    assert get_original_bases(Bar) == (Foo[int], float)
    assert get_original_bases(Baz) == (list[str],)
    assert get_original_bases(Eggs) == (NamedTuple,)
    assert get_original_bases(Spam) == (TypedDict,)
    assert get_original_bases(int) == (object,)