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.
在正定提出“半城郊型”经济发展路子，在福建提倡念好“山海经”，在浙江统筹城乡发展、擘画“千万工程”，在上海探索特大型城市管理新模式……经得起历史和实践检验的政绩，始终建立在“以调研开路”“从实际出发”的基础上。
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，更多细节参见safew官方版本下载
cmd: [Function: cmdValidatePromo], // The command waiting to be executed，这一点在heLLoword翻译官方下载中也有详细论述
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