> Here are three models for address selection when both site-local and global
> addresses are available.  Which (if any) is preferred:

fourth model:

discourage use of site-locals when stable global addresses are available:

Pros: drastically reduces complexity of applications that would otherwise
      have to deal with site-locals

      doesn't artifically split the problem of apps dealing with 
      renumbering into local vs. non-local applications.
      
Cons: does not permit use of site-locals for avoiding the effects
      of renumbering for local applications.
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