During March 2025, Kvanttt focused on stabilizing the public API surface of the Kotlin/kotlinx.coroutines repository by addressing migration risks and enhancing type safety. They implemented explicit return types for functions in Migration.kt and updated combineLatest to return Flow<R>, supporting the integration of bug fix KT-74325. This work improved API predictability and reduced ambiguity for downstream projects relying on kotlinx.coroutines. Kvanttt applied their expertise in Kotlin, API development, and code refactoring to ensure safer migration paths and clearer usage guarantees. The depth of their contribution lay in careful planning and execution to minimize potential regressions during dependency upgrades.