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This was a long-ago intended change since version 5.8. But at that time, Carthage fails to create valid cache hash when no ObjC header generated.
#1307
Now Carthage has fixed that issue, and it seems that Carthage built frameworks on Xcode 12 is failing at merging the headers from different frameworks when they have conflicting type names (#1517 and Alamofire/Alamofire#3303). So it seems that now it is another good chance to apply this.
It removes support of Objective-C so there would be no header conflicting anymore with another project. (Regardless of it being an Xcode issue or a Carthage issue.)