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

@yutakahirano its due to the async primitives the polyfil has available.  It has to use something like setTimeout.  Unfortunately, if you nest more than 4 or 5 setTimeout calls it will begin forcing the delay to a minimum of 4ms.  This places the upper bound of an async loop like this at 250 ops/sec.

In theory something like postMessage could avoid the 4ms clamping, but I think browsers have started doing it for nested postMessage recently as well.

The polyfil needs something like node's nextTick to perform well on this test.

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