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

> +    return false;
> +  }
> +
> +  return true;
> +}
> +
> +function WritableStreamAbort(stream, reason) {
> +  const state = stream._state;
> +  if (state === 'closed') {
> +    return Promise.resolve(undefined);
> +  }
> +  if (state === 'errored') {
> +    return Promise.reject(stream._storedError);
> +  }
> +
> +  assert(state === 'writable' || state === 'waiting' || state === 'closing');

Good catch. The differentiation is now working just as a cache for reducing backpressure signal checking. I'll try to remove it.

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