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.
第一百零六条 为了查明案情，需要解决案件中有争议的专门性问题的，应当指派或者聘请具有专门知识的人员进行鉴定；鉴定人鉴定后，应当写出鉴定意见，并且签名。
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