StoryboardViewControllerIdentifier.callAsFunction(creator:) should return non-optional value
#890
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This method calls
UIStoryboard.instantiateViewController(identifier:creator:)internally, which returns a non-optional view controller. Therefore, it is unnecessary to return optional value in theStoryboardViewControllerIdentifiermethod.See also: https://developer.apple.com/documentation/uikit/uistoryboard/3213989-instantiateviewcontroller