Re: [whatwg/streams] Align WritableStream structure with ReadableStream structure (#488)

>  
>      return this._closedPromise;
>    }
>  
> +  get desiredSize() {
> +    if (IsWritableStreamDefaultWriter(this) === false) {
> +      throw CreateWritableStreamDefaultWriterBrandCheckException('desiredSize');
> +    }
> +
> +    if (this._ownerWritableStream === undefined) {
> +      throw CreateWritableStreamDefaultWriterLockException('desiredSize');
> +    }
> +
> +    return WritableStreamDefaultWriterGetDesiredSize(this)
> +  }
> +
>    get ready() {

It would technically be a normative change as we would stop returning the same promise every time and start returning a new one for each function invocation. But I think that would be OK.

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