Comment by BrendanEich

The Mocha prototype was better than what I did after the ten days. The biggest wart, == implicitly converting operand types, came after the ten days and was me being an idiot by agreeing with early inside-Netscape adopter requests for slop.

Ryan Dahl gave a speech decades later saying "don't do them" when you are tempted to add little features that might be "cute": https://youtu.be/M3BM9TB-8yA?t=900.

Unfixability is a property of the Web and applies to CSS and HTML as well as JS.