Typescript is another one where null and undefined are unique singleton types, which are encompassed under the catch-all `any` type but, if strictness is turned

Typescript is another one where null and undefined are unique singleton types, which are encompassed under the catch-all `any` type but, if strictness is turned on, are rejected by any other type matching. doThingA(param: any) // you can pass anything including null and undefined doThingB(param: object | number | string | boolean | bigint | symbol) // you can pass anything except null and undefined