suspend fun CoroutineScope.foo() : ReceiveChannel<List<Int>> =
    produce {
        launch {
            val cache = cache.getCachedInts()
            offer(cache)
        }
        launch {
            val network = network.getNetworkInts
    
            if (network.isNotEmty()) {
                cache.cacheInts(network)
            }
    
            offer(network)
        }
    }

runBlocking

Dispatchers.Unconfined

GlobalScope.launch(Dispatchers.Unconfined) {
            ...
}