What is the process named TestFlightServiceExtension on my iPhone 6S, iOS 14.4? It also can be found in one (1) crash report over the internet. Is this process safe?

What is the process named TestFlightServiceExtension on my iPhone 6S, iOS 14.4? Is it safe?

What is the process named com.apple.dt.DTConditionInducerSupportService on my iPhone 6S, iOS 14.4?

I need to unpack .tar.gz. Unfortunately, there is no built-in tool for that in iOS.Is it possible to copile a minitar example from libarchive (https://github.com/libarchive/libarchive/tree/master/examples/minitar) as a standalone library? I don't want to include the entire libarchive, due to it's size and complexity.

I have a XGBoost.Booster which recieves a sparce matrix returned by FeatureHasher. There is no feature names. How to convert this type of model to CoreML and how to pass an array to that model?

It's not specified in the documentation. Do NSJSONSerialization output JSON in the canonical form?

Hello! I want to clarify the usage scope of auto-renewable subscriptions. The guideline telling us:"If you offer an auto-renewing subscription, you must provide ongoing value to the customer. While the following list is not exhaustive, examples of appropriate subscriptions include: new game levels; episodic content; multi-player support; apps that offer consistent, substantive updates; access to large collections of, or continually updated, media content; software as a service (“SAAS”); and cloud support."So, it's emphasises, that there could be other cases. I want to be sure will my app be approved by the review, or not.My application is an offline business utility. It doesn't provide any cloud services or updating media content. The only reason to use subscriptions is that the app will be consistently updated according to: iOS updates, user suggestions, new features and bug fixes. So it's probably one of "apps that offer consistent, substantive updates", isn't it?What should I write to users and to Apple so that the app will be able to pass review?There are many reasons why I like auto-renewable subscription model, besides 85% revenue. It sufficiently lowers barriers for a user, thanks to the free trial and ability to cancel if the first experience was not satisfying. Moreover, it provides great feedback: looking at subscribed users count I'm able to decide, should I spend more time supporting this application, or should I pay attention to another, more successful aps. I also can release the app earlier, and gradually improve it constantly listening to user feedback. It's better than make a technically ideal paid app that nobody will buy. And I think it just more fair, because todays app are not "fire and forget" products and require continuous maintenance and updates.