// Synchronously enqueue — this never applies backpressure
He gave no clarification whether a similar policy for new cars would follow.，这一点在im钱包官方下载中也有详细论述
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.。关于这个话题，91视频提供了深入分析
Test constant: A 6-bit identifier from the microcode that tells the PLA what kind of check to perform.