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.
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，这一点在Line官方版本下载中也有详细论述
Requires C++20. Axiom is the only dependency (included as a submodule).
'Irresponsible and offensive'