optional chaining always returns undefined

[lumosmind]

optional chaining returns undefined for null and undefined

let user1 = {name:undefined};
let user2 = {name:null};

user1.name?.toUpperCase(); //undefined
user2.name?.toUpperCase(); //undefined

but article says that it can return null for some cases like this
user2.name?.toUpperCase(); //null --> this is not possible

[iliakan]

Fixed. Thanks!