drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.
A/B testing variations，详情可参考heLLoword翻译官方下载
，更多细节参见im钱包官方下载
// TypeError: Cannot obtain lock — stream is permanently locked，这一点在搜狗输入法2026中也有详细论述
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