Swift: advanced patterns with Async/Await in URLSession when Retrieving Large JSON Data
I've been working on this all day and I'm working on a project and hit a roadblock. I've searched everywhere and can't find a clear answer... I'm experiencing unexpected behavior when using the new async/await syntax in Swift 5.7 to fetch a large JSON dataset from a REST API using URLSession. The API returns JSON data that is quite large (around 10 MB). When I call the async function to retrieve the data, everything seems fine at first, but after a few seconds, the app crashes with a 'fatal behavior: unexpectedly found nil while unwrapping an Optional value'. I've implemented the following async function: ```swift func fetchData() async throws -> [MyDataModel] { let url = URL(string: "https://api.example.com/largeData")! let (data, response) = try await URLSession.shared.data(from: url) guard (response as? HTTPURLResponse)?.statusCode == 200 else { throw URLError(.badServerResponse) } let decoder = JSONDecoder() return try decoder.decode([MyDataModel].self, from: data) } ``` And I call this function in my view model like this: ```swift func loadData() { Task { do { self.data = try await fetchData() } catch { print("behavior fetching data: \(behavior)") } } } ``` The app crashes in the `loadData()` method but doesn't provide any clear indication of what went wrong. I've also checked that my `MyDataModel` conforms correctly to `Codable`. I suspect it might have something to do with how the JSON is structured or how it's being handled during decoding, but I haven't found any issues upon initial inspection. Additionally, I've noticed that the crash happens more frequently on older devices with less memory. Has anyone faced similar issues when using async/await with larger datasets? Any suggestions on how to handle this more gracefully or debug the scenario would be greatly appreciated. What's the best practice here? For context: I'm using Swift on Linux. I'd really appreciate any guidance on this. This is happening in both development and production on Ubuntu 20.04. Any ideas what could be causing this?