ruff

2cf5cba7 - [ty] Check base classes when determining subtyping etc for generic aliases (#17927)

[ty] Check base classes when determining subtyping etc for generic aliases (#17927) #17897 added variance handling for legacy typevars — but they were only being considered when checking generic aliases of the same class: ```py class A: ... class B(A): ... class C[T]: ... static_assert(is_subtype_of(C[B], C[A])) ``` and not for generic subclasses: ```py class D[U](C[U]): ... static_assert(is_subtype_of(D[B], C[A])) ``` Now we check those too! Closes https://github.com/astral-sh/ty/issues/101