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.
但要理解这里面的差异和进步，我们要先弄懂那些少则三五块、多则几十块的「防窥膜」是怎么实现防窥的。
，这一点在同城约会中也有详细论述
▲ 附上地址：https://ai.google.dev/gemini-api/docs/pricing#gemini-3.1-flash-image-preview
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