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Simpler version of #292 ; remove the goroutine and rely on our channels being longer than the number of responses we get (which we think should always be the case)
Should save a bit of CPU too since we're not spinning up so many routines.
Removed the channel-closing stuff so we'll never get a 'send on closed channel', we just bail out of the loop when we get one that's marked Done and let the GC clean it up later.