Worked on stabilizing the API surface of the Kotlin/kotlinx.coroutines repository by addressing migration risks and enhancing type safety. Focused on the Migration.kt module, the developer implemented explicit return types for public API functions and extended Flow<R> return signatures in combineLatest to support the KT-74325 fix. This approach improved code readability and predictability, making downstream integration safer for projects relying on kotlinx.coroutines. The work involved code refactoring and careful API design using Kotlin, with an emphasis on type safety and migration planning. These changes reduced ambiguity and potential regressions for users upgrading dependencies, supporting ongoing API stabilization efforts.