[JonathonW]

Keep in mind that Homebrew clones tap repositories when you do 'brew tap'-- this has two major implications if you're keeping your formula in your main source repository:

(1) You're pushing down bits onto users' machines that may not be necessary (like developer documentation, or development versions of your source code if you're developing on master), and

(2) 'brew update' will need to download (via 'git pull') all changes to your repository any time you update, even when the Homebrew formula doesn't change.

Keeping formulas in a separate repository allows Homebrew to work like it's supposed to (and like it does for built-in formulas): an update to your tap repository means there's updates for the formulas that it contains, and you're not downloading any source code except what's actually going to be used, at the time it's going to be used (during 'brew install').