- warn if running `brew postinstall` explicitly and there's no `post_install` defined in the formula - add a `post_install` alias for `brew postinstall` to make life easier for those jumping between `postinstall` and `post_install` in e.g. Homebrew development - refactor `post_install` formula path logic into a new method for improved readability - handle the JSON API `post_install` formula path case