TypeScript: Can anyone difference between unknown and any? [duplicate]

Question

I have a type:

type Action<I extends unknown[], O> = (...args: I) => Promise<O>;

and some test cases:

// should be [boolean, string]
type TestInput = Input<Action<[boolean, string], number>>;
// should be number
type TestOutput = Output<Action<[boolean, string], number>>;

I wrote the Input type using unknown for O and it works:

type Input<A> = A extends Action<infer I, unknown> ? I : never;

then I wrote the Output type using unknown[] for I:

type Output<A> = A extends Action<unknown[], infer O> ? O : never;

and it doesn't works, the TestOutput is never.

But when I changed unknown[] to any[] it works:

type Output<A> = A extends Action<any[], infer O> ? O : never;

Can anyone explain why?

P.S. I also wrote this test:

type Test = [boolean, string] extends unknown[] ? true : false;

and the Test is true, so I don't understand why the Output with unknown[] for I is not works.