"Birds of a Feather" by Billie Eilish (Episode 5)
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以研发投入规模为分界线，企业规模同样呈现橄榄球状。在研发投入集中的亿元、千万元区间，由于企业数量较多，出现了远超其他区间的研发强度最高值。
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.