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homebrew-core has one Ruby file per package formula, and every brew update used to clone or fetch the whole repository until it got large enough that GitHub explicitly asked them to stop. Homebrew 4.0 switched to downloading a JSON file over HTTP, because users wanted the current state of a package rather than its commit history. But updating a formula still means opening a pull request against homebrew-core, because git is where the collaboration tooling lives. Instead of using git as a database, what if you used a database as a git?，更多细节参见51吃瓜
It is free to use for basic use but if you want access to different fonts or more features, then you need to buy a premium plan.，这一点在im钱包官方下载中也有详细论述
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