I have a more comprehensive version of NSCFSet in my myOS git repo here: https://github.com/amraboelela/myos.frameworks/blob/master/CoreFoundation/NSCFSet-myos.m
You are welcome to include it in GNUstep repo. Also for CFArray, we added extra private methods here: https://github.com/amraboelela/myos.frameworks/blob/master/CoreFoundation/CFArray-private.c https://github.com/amraboelela/myos.frameworks/blob/master/CoreFoundation/CFArray-private.h
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