What are the main limitations or problems that may arise when interacting between Kotlin and Swift in cross-module integration?

When integrating Kotlin and Swift across modules (for example, in cross-platform development with Kotlin Multiplatform), the following main limitations and issues may arise:

• Differences in data types: Kotlin and Swift have different type systems, which may require manual mapping or adaptation of types (e.g., nullable types, collections).

• Error handling: Error handling mechanisms in Kotlin (exceptions) and Swift (throws) differ, complicating error transmission between modules.

• API compatibility: Automatically generated interfaces may not always be convenient or idiomatic for Swift, requiring additional wrapping.

• Memory management: Kotlin/Native uses its own memory management mechanism (concurrent garbage collector), while Swift uses ARC, which can lead to lifecycle issues when used together.

• Asynchrony: Different models of asynchronous programming (coroutines in Kotlin and async/await in Swift) require adaptation when interacting.

• Tools and build: Setting up build configurations and integrating Kotlin libraries into Xcode projects can be complex and require additional configuration.

Successful integration requires careful planning, understanding of limitations, and possibly writing adapters for smooth operation between Kotlin and Swift.