* Use `ARGV.include?` instead of `ARGV.first ==`, so users can pass
`-v`/`-d` before the function flags(i.e. `--list-pinned` etc)
* Restore the ability to call `brew tap --flags tap/name`.
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.