Function pull

benchmark/streams/iter-throughput-identity.js:68–77

(controller)

    let remaining = datasize;
    const rs = new ReadableStream({
      pull(controller) {
        if (remaining <= 0) {
          controller.close();
          return;
        }
        const size = Math.min(remaining, chunk.length);
        remaining -= size;
        controller.enqueue(
          size === chunk.length ? chunk : chunk.subarray(0, size));
      },
    });
    const ws = new WritableStream({
      write() {},