This blog post explores type confusion vulnerabilities in JavaScript, specifically how bypassing input validation and sanitization can lead to cross-site scripting (XSS) or code injection vulnerabilities. The authors demonstrate how using array values as unexpected input types can bypass certain security fixes, such as prototype pollution and XSS prevention mechanisms. They provide examples of how this vulnerability can be exploited in popular libraries like edge.js and how it can be remediated by ensuring proper handling of input types and sanitization. The post highlights the importance of documenting input type behavior and provides guidance for developers, maintainers, and security researchers on how to prevent and mitigate these vulnerabilities.