the first append allocates a backing store of length 4 from the stack.
This is better in that there is far less boilerplate, but it doesn't solve everything. Async iteration was retrofitted onto an API that wasn't designed for it, and it shows. Features like BYOB (bring your own buffer) reads aren't accessible through iteration. The underlying complexity of readers, locks, and controllers are still there, just hidden. When something does go wrong, or when additional features of the API are needed, developers find themselves back in the weeds of the original API, trying to understand why their stream is "locked" or why releaseLock() didn't do what they expected or hunting down bottlenecks in code they don't control.
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Synchronous fast paths matter，详情可参考91视频
"Many of these churches have been on these sites for probably 1,000 years, and probably as long as they've been standing they've had bats in them," says Diana Spencer, from the Bats in Churches Project.