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This makes the evaluation cache incremental. Each evaluated attribute is cached individually along with the files and environment variables it touched. When you change one thing, only the attributes that depend on that change are re-evaluated; everything else is served from cache. A single evaluation now covers devenv shell, devenv test, devenv build, and every other command. When nothing changed (verified by content hash), the cached result is returned immediately without invoking Nix at all.
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2011 年，淘宝网的单日成交额就已经达到了 43.8 亿元，三年后，京东和阿里巴巴就先后在美国上市，这意味着线上电商从补充渠道变成了一条能跑出巨头的主赛道。