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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A code card for Pokémon TCG Live，详情可参考Line官方版本下载
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Columbia was unable to withstand the fiery re-entry into the Earth's atmosphere, disintegrating as the world watched on in horror.