What TransformStreams are supposed to do is check for backpressure on the controller and use promises to communicate that back to the writer:
，推荐阅读safew官方版本下载获取更多信息
There’s a saying that “abstractions are always leaky”.
（一）典当业工作人员承接典当的物品，不查验有关证明、不履行登记手续的，或者违反国家规定对明知是违法犯罪嫌疑人、赃物而不向公安机关报告的；