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（图源：石头科技 2025 年半年度报告）
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靑 “김어준 유튜브 법적 조치 가능성”… 與서도 ‘金 손절론’ 확산
the dotnet version uses BDDs (binary decision diagrams) for the same purpose, which is the right call for UTF-16 where you have 65536 possible values. but for bytes, a flat bitvector is simpler, faster, and fits in four registers. no tree traversal, no cache misses, no allocations. the Solver type in resharp-algebra is basically a deduplicated store of these bitvectors - each unique character set gets a TSetId, and all operations go through the solver to maintain sharing.