But mapv is a higher-order function. It receives alength as a generic IFn object and calls invoke() on it for every item. This means that:
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None of this is wrong. These guarantees matter in the browser where streams cross security boundaries, where cancellation semantics need to be airtight, where you do not control both ends of a pipe. But on the server, when you are piping React Server Components through three transforms at 1KB chunks, the cost adds up.