We need to manually specify these now so let's add a few that we'd
either previously documented or we've caught being used in the wild and
adjust the documentation accordingly.
This is the (partially) documented public API for Homebrew.
The main class you should look at is the {Formula} class (and classes linked from there). That's the class that's used to create Homebrew formulae (i.e. package descriptions). Assume anything else you stumble upon is private.
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