Re: [streams] rsReader.readBatch(numberOfChunks)? rbsReader.read(view, { waitUntilDone: true })? (#320)

> I don't think this necessarily applies to Firefox. We definitely have overhead for native promises due to our cycle collector (like chrome's oilpan I think), but I haven't seen or heard evidence about GGC nursery issues. We can make improvements to the CC (and other native promise bits) but we're unlikely to see anything approaching a 300% improvement.

I was able to talk to one of our CC experts on the way out of the office today.  He informed me c++ backed js objects like promises are not currently permitted in the GGC nursery.  So we do have that problem.  Its unclear if this is fixable since promises can hold references back to other js objects.

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