I tend to read these sorts of articles as "don't do stupid things". Who in their right mind would name an argument undefined? (or use a library by someone who w

I tend to read these sorts of articles as "don't do stupid things". Who in their right mind would name an argument undefined? (or use a library by someone who would do so) The operative sentence in the article to me is "can be avoid if you understand how it works". On an unrelated note I'm not sure if that's a typo or a pun.