Stream implementations can and do ignore backpressure; and some spec-defined features explicitly break backpressure. tee(), for instance, creates two branches from a single stream. If one branch reads faster than the other, data accumulates in an internal buffer with no limit. A fast consumer can cause unbounded memory growth while the slow consumer catches up, and there's no way to configure this or opt out beyond canceling the slower branch.
第九十六条 需要传唤违反治安管理行为人接受调查的，经公安机关办案部门负责人批准，使用传唤证传唤。对现场发现的违反治安管理行为人，人民警察经出示人民警察证，可以口头传唤，但应当在询问笔录中注明。
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