In March 2025, JD contributed to the sorbet/sorbet repository by addressing a reliability issue with sealed modules in Ruby. JD focused on improving the call stack resolution logic for included and extended methods, which previously risked incorrect inheritance validation. By refining how the system parses call stacks, JD enhanced the robustness of module sealing behavior, reducing false positives in code analysis and lowering maintenance overhead for downstream projects. This work, rooted in software development best practices and deep understanding of Ruby internals, supported more predictable tooling outcomes and contributed to the ongoing stability and maintainability of Sorbet’s core analysis infrastructure.