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

> +
> +    if (this._ownerReadableByteStream === undefined) {
> +      return;
> +    }
> +
> +    if (this._readIntoRequests.length > 0) {
> +      throw new TypeError('Tried to release a reader lock when that reader has pending read() calls un-settled');
> +    }
> +
> +    if (this._ownerReadableByteStream._state === 'readable') {
> +      CloseReadableByteStreamReader(this);
> +    }
> +  }
> +}
> +
> +function CallPull(controller) {

Prefixed f174dd56021e124aa055566a53bd95145a85f180

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