刚才在统计Clash到底有多少个客户端的时候，突然发现sing-box的github下载里，Windows平台下，光amd64的下载就有三个版本：amd64-legacy, amd64, amd64v3。我去，这到底是什么意思？然后网上做了点功课，搜索到这么一个回复： 
> https://github.com/golang/go/wiki/MinimumRequirements#amd64
> https://en.wikipedia.org/wiki/X86-64#Microarchitecture_levels
> 
> Go 1.18 introduced 4 architectural levels for AMD64. Each level differs in the set of x86 instructions that the compiler can include ...