Some of the typing/`T.must` usage when moving the
Homebrew/homebrew-services code to Homebrew/brew was not quite correct.
Rather than trying to make everything `strict` and import at the same
time: let's mostly loosen the typing to fix a few bugs and allow us to
add more later.
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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