Re: [whatwg/streams] add @@asyncIterator to ReadableStreamDefaultReader (#950)

TimothyGu commented on this pull request.



> +    if (typeof O !== 'object') {
+      throw new TypeError();
+    }
+    const reader = O._reader;
+    const read = reader.read;
+    return read.call(reader);
+  },
+  return() {
+    const O = this;
+    if (typeof O !== 'object') {
+      throw new TypeError();
+    }
+    if (O._cancel === true) {
+      const reader = O._reader;
+      const cancel = reader.cancel;
+      cancel.call(reader);

This does not implement [GetMethod](https://tc39.github.io/ecma262/#sec-getmethod) fully. Additionally I'd prefer using `Reflect.apply()`.

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