AppAuth-iOS
                                
                                
                                
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                        Retain Cycle due to strong reference to PresentingViewController
Describe the bug When initialize AppAuth in singleton and then pass the presentingViewController, it's resulting in retain cycle.
So we have created this PR, which based on our fork that we are using for almost a year or more with no noticeable issue: https://github.com/openid/AppAuth-iOS/pull/919