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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As she exited the event center where the deposition was held, Hillary Clinton told reporters that Maxwell had come to the wedding as a guest of someone else and that she had told the committee she only knew Maxwell “as an acquaintance.”