vsapsai added a comment.

In https://reviews.llvm.org/D43787#1019886, @kubamracek wrote:

> Great! So the versions in `ObjCRuntime.h` didn't really match what the iOS 
> and macOS supported?


Yes, support for assigning nil for a key for NSMutableDictionary was added in 
macOS 10.11, iOS 9. Earlier versions require libarclite.


https://reviews.llvm.org/D43787



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