On Jul 31, 2014, at 09:05 , Sean McBride <s...@rogue-research.com> wrote:

> Other than use of 'weak', how else might something be changed in a 
> non-KVO-compliant manner in ARC but not GC?  Again, the error is only in ARC 
> and not GC.

I’m not sure this is the most productive way to approach this. The detection of 
an error may depend on the order of deallocation, so your ARC and GC 
implementations may be equally incorrect, but the error not equally reported.

Also, the aggressiveness with which this error is reported may vary with the 
system version and the memory model. I had the impression that Mavericks was 
checking for dangling observers more thoroughly than earlier versions. 




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