Here is re-post of an internal post:
Here are some rules of thumb when to use each level of tests:
，更多细节参见体育直播
Lean is the result of over twelve years of continuous development. We designed and built every layer from scratch: the trusted kernel, the compiler, the language server, the IDE, the proof automation. The team is 20 people. The community independently chose Lean: mathematicians, AI researchers, and enterprise engineers, all building on the same platform.，更多细节参见同城约会
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