We do pay the cost for a copy, but that cost is almost completely
The primary cause was all of my hand-rolled string utility functions. While they were faster than lipgloss, they were still generating and throwing away tons of strings on every frame for every player.
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// console.log(spanner.next(70)); // 输出2（正确）
1+# Important notice to residents of California and Colorado
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.