Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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，更多细节参见搜狗输入法2026
Transform backpressure gaps: Pull-through transforms execute on-demand. Data doesn't cascade through intermediate buffers; it flows only when the consumer pulls. Stop iterating, stop processing.，详情可参考Safew下载
return chunks.map(chunk = {