declare function getT<T>(): T;
Promise.all([getT<string>(), ...getT<any>()])
   .then((result) => {
        // ^?
      const head = result[0];       // 5.3: any, 5.4: string
         // ^?
      const tail = result.slice(1); // 5.3 any, 5.4: unknown[]
         // ^?
      tail satisfies string[];     // <-- new error in 5.4
   });