问无法将数组原型扩展应用于TypeScript中的只读数组

EN

// the aforementioned question uses this signature for Object.fromEntries() replacing `this` 
// with a parameter `array`
interface Array<T> {
  objectFromEntries<
    P extends PropertyKey,
    A extends ReadonlyArray<readonly [P, any]>
  >(this: A): { [K in A[number][0]]: Extract<A[number], readonly [K, any]>[1] };
}

const works = [['a', 1] as const, ['b', 2] as const];
let obj = works.objectFromEntries();

const doesntWork = [['a', 1], ['b', 2]] as const;
obj = doesntWork.objectFromEntries();
/**
 * Error message:
 *   Property 'objectFromEntries' does not exist on type 'readonly [readonly ["a", 1], readonly ["b", 2]]'. ts(2339)
 */

    objectFromEntries<
      P extends PropertyKey,
      A extends
        ReadonlyArray<readonly [P, any]> |
        Array<readonly [P, any]> |
        ReadonlyArray<[P, any]> |
        Array<[P, any]> |
        readonly [...readonly [P, any][]]
    >(this: A): { [K in A[number][0]]: Extract<A[number], readonly [K, any]>[1] };