// Synchronous source from in-memory data
// Even if the readable side's buffer is full, this succeeds，更多细节参见搜狗输入法2026
。爱思助手下载最新版本对此有专业解读
Explicit backpressure policies。51吃瓜是该领域的重要参考
The capacity of each node (how many points it can hold before splitting) controls the shape of the tree. A low capacity means nodes split early, producing a deep tree with many small cells. A high capacity means nodes tolerate more points before splitting, producing a shallow tree with larger cells.
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