Worked on improving the stability of the pointfreeco/swift-composable-architecture repository by addressing a concurrency-related crash in the RootCore module. Focused on preventing crashes during the deinitialization of AnyCancellable instances when executed outside the MainActor, the solution involved marking closures as @Sendable to ensure thread-safety in concurrent environments. This change enhanced the reliability of the codebase for iOS development using Swift and SwiftUI, particularly in scenarios leveraging Combine for reactive programming. The work demonstrated a careful approach to concurrency and memory management, resulting in a more robust architecture for developers working with asynchronous and multi-threaded Swift applications.