89d0309b9c
This flag allows you to specify formulae to upgrade, even if `$HOMEBREW_BUNDLE_NO_UPGRADE` is set. This is useful for upgrading specific formulae without upgrading all formulae. While we're here, let's add Sorbet signatures to the `Bundle` module because I needed to add a new method there anyway.
Library
This directory contains all the code run by the official brew command in Homebrew and all formulae (package descriptions) in taps (repositories containing formulae) in Taps subdirectories.