Worked on the facebook/fbthrift repository to address API stability and maintain compatibility for Thrift union fields. Focused on C++ code generation, the developer restored reference accessors for union fields by reverting a previous change that had removed the _ref methods. This targeted bug fix ensured that downstream projects relying on reference-based access to union fields continued to function without disruption. By carefully scoping the revert, the work minimized risk and avoided broader changes to the API surface. The approach prioritized correctness and user impact, validating that reference access remained available and reducing potential friction for consumers upgrading their dependencies.