Feature request: rule that completely disallows typing.cast

[wyattscarpenter]

cast() gets around static type safety without ensuring dynamic type correctness. Sometimes you have to use it—you know how it is—but it's not ideal. (For instance, mypy documentation seems to imply the main use of cast is when the typechecker or type annotations aren't quite good enough.) That means, in my opinion, cast is a great candidate to have a rule disallowing its use, to ensure code quality in codebases where it is not needed, even if that rule is ultimately optional.

[AlexWaygood]

Cross-referencing the similar issues over at mypy:

• Feature request: option that completely disallows typing.cast python/mypy#17077
• Safe cast (upcast) python/mypy#5756