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.
作为对比，Nano Banana 2 还带来了 1:4、4:1、1:8、8:1 长宽比图片生成，这是之前的 Pro 模型所不能做到的。
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