facilities to Python’s type system. This design is inspired largely by
PBR/Light Transport
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Enterprise teams already use Lean in production: AWS verified its Cedar authorization policy engine, and Microsoft is using Lean to verify its SymCrypt cryptographic library. Over 8,000 GitHub repositories contain Lean code. Over 200,000 users have installed the programming environment. More than 700 people are active in the Lean Zulip channel every day. Research groups worldwide contribute to the ecosystem. As Chris Lattner observed, manual rewrites and translation work are becoming AI-native tasks. AI will rewrite the world’s codebase. The platform it does so on matters enormously.
Combined traffic, January 2026
数字不会定格，新项目持续涌入。2026年新年伊始，德国尚诺科新能源项目落地太仓高新区，博纳环境设备（太仓）有限公司启用全新建设的亚太区总部，德国博可机械层压涂覆系统高端制造扩产项目落户太仓……“十五五”开局之年，德资企业正以太仓为基地，拓展中德合作链条，把握中国高水平开放、高质量发展的新机遇。