Re: [streams] Byte stream update, including reference implementation (#361)

> +    return new ReadableByteStreamReader(this);
> +  }
> +}
> +
> +class ReadableByteStreamController {
> +  constructor(controlledReadableByteStream, underlyingByteSource) {
> +    if (IsReadableByteStream(controlledReadableByteStream) === false) {
> +      throw new TypeError('ReadableByteStreamController can only be constructed with a ReadableByteStream instance');
> +    }
> +
> +    if (controlledReadableByteStream._controller !== undefined) {
> +      throw new TypeError(
> +          'ReadableByteStreamController instances can only be created by the ReadableByteStream constructor');
> +    }
> +
> +    const pullFunction = underlyingByteSource['pull'];

Fixed by https://github.com/whatwg/streams/commit/6bd7b93bd92ca5bd257c3c27eeda40ffc5c466b1

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