Homebrew receipt has been updated to 1.5 just a few hours later!
https://github.com/Homebrew/homebrew/commit/dee292132fb73820...
This doesn't look like 1.4 but _1.0.0-beta.4_, so much older.
https://github.com/Homebrew/homebrew/commit/dee292132fb73820...
https://github.com/Homebrew/homebrew/blob/master/Library/For...