It does not support it on its own. You could build that functionality into an app as far as features go, but how easy they are to isolate will probably vary wildly, and it may be more work than it's worth.
It would mean only pushing updates to some users and not others, which would have to be supported by the App Store. Unless you jerry-rigged some way of separating your "updates" from the actual binary updates distributed by the app store, which, yes, would probably be more work than it's worth.
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It does not support it on its own. You could build that functionality into an app as far as features go, but how easy they are to isolate will probably vary wildly, and it may be more work than it's worth.
It would mean only pushing updates to some users and not others, which would have to be supported by the App Store. Unless you jerry-rigged some way of separating your "updates" from the actual binary updates distributed by the app store, which, yes, would probably be more work than it's worth.