In April 2025, Andreu Botella enhanced the tc39/test262 repository by clarifying string comparison semantics and expanding test coverage. He focused on ensuring that string comparisons in JavaScript are performed per code unit rather than per code point, addressing a subtle but important aspect of Unicode handling. Andreu implemented comprehensive tests that validate this behavior across a wide range of Unicode characters, improving the reliability and conformance of the test suite. He also refined the related documentation to clearly communicate these semantics. His work demonstrated depth in JavaScript, Unicode, and testing, contributing to more robust language specification validation.