Jon Hehir worked on the IBM/velox repository, where he generalized the distribution range types in the QuantileDigest component to support any generic type T. By refactoring the getDistributionFunction to accept rangeStart and rangeEnd as generic types, Jon improved the type safety and consistency of quantile distribution calculations. He updated the associated QuantileDigestTest.cpp tests to use generic types instead of doubles, ensuring alignment with the new implementation. This work, implemented in C++ and leveraging his expertise in software engineering and type systems, addressed the need for broader type compatibility in QDigest distribution, demonstrating a focused and technically sound engineering approach.