The async iterator based approach provides a natural bridge between this alternative approach and Web streams. When coming from a ReadableStream to this new approach, simply passing the readable in as input works as expected when the ReadableStream is set up to yield bytes:
Every fragment means promises created for read() calls, promises for backpressure coordination, intermediate buffer allocations, and { value, done } result objects — most of which become garbage almost immediately.
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for (let i = len2 - 1; i = 0; i--) {