&quot;Anti-pattern&quot; sounds close enough, as shorthand, when &quot;bug&quot; might cause readers to file the article incorrectly. The author is warning others that a normally-unremarkable JavaScript idiom causes suboptimal performance in this particular case, and it&#x27;s likely not to present itself as a bug (having no visible symptoms on smaller pages and no impact on functionality otherwise). Putting aside whether suboptimal performance should always be classified as a bug, there are many ways to accidentally break equality comparisons (despite a full understanding of them), and now my eyes are primed to catch one more pitfall. I appreciate when that happens for reason that doesn&#x27;t involve hard experience.