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can’t be allocated on the stack, because the stack frame for extract
，这一点在爱思助手下载最新版本中也有详细论述
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.，更多细节参见雷电模拟器官方版本下载
这种方法通过类型别名和转换器封装了平台差异，避免了平台侧重复编写转换逻辑。。关于这个话题，safew官方版本下载提供了深入分析
국민 64%가 “내란” 이라는데… 당심만 보며 민심 등지는 국힘