> On 5 Dec 2015, at 17:31, Alex Zavatone <z...@mac.com> wrote:
> 
> Weak.
> 
> There is only one reference to it, right?
> 

It seems that the actual answer is “it depends”……. But making them strong 
unless you specifically need to do otherwise seems like the best practise 
approach…..

Dave




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