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Compiling an app with Xcode 26 beta 5/6/7 fails with Ambiguous use of 'performAndWait' in the Iterable iOS SDK. The SDK's CoreDataUtils.swift defines an extension on NSManagedObjectContext: a performAndWait generic function taking a throwing closure and returning T, which now collides with the new iOS 26 CoreData method of the same signature. Removing the SDK extension fixes the compile error.

Fixed upstream: update the Iterable iOS SDK to 6.6.1 or later, where the fix was released. Reporter raid5 confirmed the issue is resolved on the latest master commit and the team closed the issue after the release.

Source: https://github.com/iterable/iterable-swift-sdk/issues/945

Source: https://github.com/iterable/iterable-swift-sdk/issues/945