Just spotted a typo "mulitple" in case the author lurks in the comments here :). ("You'll pay it mulitple times over when you need to debug why your code doesn'

Just spotted a typo "mulitple" in case the author lurks in the comments here :). ("You'll pay it mulitple times over when you need to debug why your code doesn't work (either locally, in the test suite, or in production).")