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One problem in the past was -[NSArray firstObject], which many developers used as a category method, with differing implementations. Apple added it to the Mac OS X 10.9 SDK but actually implemented the method silently in 10.6!


Interestingly it seems to be 10.6+ in the documentation. They backdeploy like that sometimes I guess.


Read the real documentation, the archive. ;-) https://developer.apple.com/library/archive/releasenotes/Fou...


I’m quite upset we don’t have release notes like this anymore.




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