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docs: explain why upgrade upgrades unrelated stuff

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Jonathan Chang 2020-11-25 17:46:10 +11:00
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docs/FAQ.md
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@ -45,6 +45,9 @@ When automatic `brew cleanup` is disabled, if you uninstall a formula, it will o
In this case, to remove a formula entirely, you may run `brew uninstall --force <formula>`. Be careful as this is a destructive operation.
## Why does `brew upgrade <formula>` also upgrade a bunch of other stuff?
Homebrew doesn't support arbitrary mixing and matching of formula versions, so everything a formula depends on, and everything that depends on it in turn, needs to be upgraded to the latest version as that's the only combination of formulae we test. As a consequence any given `upgrade` or `install` command can upgrade many other (seemingly unrelated) formulae, if something important like `python` or `openssl` also needed an upgrade.
## Where does stuff get downloaded?
brew --cache