No base class to extend, no abstract methods to implement, no controller to coordinate with — just an object with the right shape.
Фото: Павел Родимов / Фотобанк Лори
，这一点在搜狗输入法2026中也有详细论述
第五十条 办理退（免）税的出口业务发生销售折让、中止或者退回等情形的，纳税人应当缴回已退（免）税款。
The problem compounds in pipelines. Each TransformStream adds another layer of promise machinery between source and sink. The spec doesn't define synchronous fast paths, so even when data is available immediately, the promise machinery still runs.