Re: [streams] Make .ready fulfill-only (#248)

> +    abort() {
> +      t.fail('Unexpected abort call');
> +      t.end();
> +    }
> +  });
> +
> +  // Wait for ws to start.
> +  setTimeout(() => {
> +    ws.write('a');
> +    t.equal(ws.state, 'waiting', 'state must become waiting synchronously on write call');
> +
> +    ws.close();
> +    t.equal(ws.state, 'closing', 'state must become closing synchronously on close call');
> +
> +    ws.ready.then(v => {
> +      t.equal(ws.state, 'closing', 'state must still be closing when ready fulfills');

I agree that this is good check about immediateness. But I'd like to confirm if you there's any other thing we want to guarantee by this expectation.

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