Clearing Quarantine for Casks

Every now and then I install an app using brew cask and Mojave/Catalina spends ages “verifying” it upon launch.

The solution for that is to clear the com.apple.quarantine attribute from it (and any internal bundles, recursively), using:

sudo xattr -dr com.apple.quarantine /Applications/AppName.app

Obviously, you should only do this for apps you trust.