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I downloaded Xcode 12.5 Beta and now an existing project does not compile with errors telling I can't use Class as a key in NSDictionary. Cannot initialize a parameter of type 'id<NSCopying>  _Nonnull const __unsafe_unretained' with an rvalue of type 'Class' I have assumes so far that while Class does not conform to NSCopying, it is safe to use as a dictionary key because it implements copy and copyWithZone:. Did anything change with that regard in the compiler/runtime shipped with Xcode 12.5? Is it safe (and endorsed practice) to cast to id<NSCopying> to silence these errors?