[rraval]

> That being said though, I'd expect that a tuple would satisfy a `any[]` type.

You have it backwards, the error in question is complaining that `any[]` does not satisfy the tuple type.

Minimal repro:

    function f(x: any[]): [number, string] {
        return x;
    }

The error matches yours:

    Type 'any[]' is missing the following properties from type '[number, string]': 0, 1

From poking the playground, `any[]` hasn't been assignable to tuples since at least v3.3.3

My guess is that the compiler got smarter around reasoning about your `SinonSub` generic and is now forcing you to deal with lingering unsoundness.

[dstaley]

Yeah, that's my assumption as well. It would explain why there's no mention of it in breaking changes, and why being specific about the generics in `SinonStub` fixes the error.

Makes me wonder what other unsoundness the compiler isn't catching.