Re: [streams] [WIP] Putting a chunk back in the readable stream queue (#275)

> @@ -159,6 +159,42 @@ export function IsReadableStream(x) {
>    return true;
>  }
>  
> +export function PutBackIntoReadableStream(stream, chunk) {
> +  if (stream._state === 'closed') {
> +    throw new TypeError('stream is closed');

Hmm, but that kind of sucks because what if you want to asynchronously make the decision to put it back or not?

Maybe we need `.read({ preventClose: true })`?? But then how do you close it later? `.cancel()` I guess??? Icky.

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