Re: [whatwg/streams] Add @@asyncIterator to ReadableStream (#980)

MattiasBuelens commented on this pull request.



>  }
 
+const AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(async function* () {}).prototype);
+const ReadableStreamAsyncIteratorPrototype = Object.setPrototypeOf({

New tests, new bugs. This way of setting up the prototype chain causes `next()` and `return()` to become enumerable properties... 🙄 

I guess I'll just resort to `Object.defineProperty` again? Or perhaps `Object.create` with a property descriptor map.

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