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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Even the reveal of two tropical-styled versions of Pikachu — one rocking sunglasses, a floral shirt, and a sunhat, the other sporting a cap and dress — struggled to compete with the starter frenzy. Normally, special Pikachu forms would dominate the discourse. This time? Supporting cast.