Re: [streams] Make .ready fulfill-only? (#245)

Re: WritableStream, I agree with you. It can also be fulfill-only. `.closed` can give us `storedError`.

> i.e. when the stream begins closing, or is closed.

Good point. `.ready` is rejected on transition to `"closing"` and again (replaced with a rejected promise) on transition to `"errored"`. If we make this fulfill-only, we cannot distinguish between them using `.ready` (with the current behavior, they're rejected with different errors). Maybe that's the only change of capability, and is not so important, I think.

We can say the same about `ReadableStream`'s `.ready`. With the current behavior, we can know that the readable stream became readable once before we check `state` in the fulfillment callback to see it being `"errored"`. I'd say that this is also not so important functionality.

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