Andreas van der Meulen enhanced the sharkdp/numbat repository by refactoring the exponent display logic to deliver consistent, human-readable rendering of all integer exponents. He reworked the pretty_exponent function in Rust, leveraging Unicode superscripts for digit representation, which improved clarity and accuracy in mathematical outputs. To ensure reliability, Andreas expanded unit test coverage to include a broader range of positive and negative exponents, addressing edge cases and reducing the risk of regression. His work focused on string manipulation and Unicode handling, resulting in more accurate user-facing results and aligning the project with its goals for precise mathematical representation.