Placido Cadilhe developed a NaN-safe arithmetic comparison utility, isgreaterequal(), for the Codecademy/docs repository, focusing on improving the reliability of learning materials. Using C++ and leveraging mathematical rigor, Placido designed the function to provide safer, clearer semantics than the built-in >= operator, specifically addressing edge cases involving NaN values. The work included comprehensive documentation updates, with practical usage examples and refined notes to guide learners and reduce confusion. Placido’s approach emphasized documentation discipline and code quality, ensuring that the new feature not only enhanced arithmetic comparison safety but also improved the clarity and accuracy of educational content.