`%WrapForValidAsyncIteratorPrototype%.next` does not validate result

[2767mr]

All variations of .next throw or reject if the result is not an object except for %WrapForValidAsyncIteratorPrototype%.next.
This is because IteratorNext is used to do that check but IteratorNext only checks if the result is an object, which also returns true for promises.

An example:

let foo = {
    [Symbol.asyncIterator]() {
         return {
              async next() {
                  return null;
              }
         }
    }
}
await AsyncIterator.from(foo).next(); //Should throw TypeError but does not

[zloirock]

#197 -> #190

[2767mr]

If this intended then the check should be removed from %WrapForValidIteratorPrototype%.next as well or at least noted in the readme.

[bakkot]

Removing the check from %WrapForValidIteratorPrototype%.next sounds good to me.