Web streams has no synchronous path. Even if your source has data ready and your transform is a pure function, you still pay for promise creation and microtask scheduling on every operation. Promises are fantastic for cases in which waiting is actually necessary, but they aren't always necessary. The new API lets you stay in sync-land when that's what you need.
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（一）船舶共同海损牺牲的金额，按照实际支付的合理修理费，减除合理的以新换旧的扣减额计算。船舶尚未修理的，按照牺牲造成的合理贬值计算，但是不得超过估计的修理费。