* Code should be very well commented: things must be explained in terms that even people not well versed with certain Z80 or Spectrum internals details should understand.
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The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
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loop for each post url