"What we see is the Netherlands is hitting constraints on all sides; the way to alleviate this is to expand [labour] supply."
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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for (int i = 1; i < 10; i++) {