ENABLE_PROJECT_THREADS=true 时按项目/话题严格路由；支持 private 或 group 模式，需在 BotFather 开启 Threaded mode；/sync_threads 同步话题列表
The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
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In microcode, the privilege check reduces to a single conditional jump:
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