On Jan 21, 2014, at 2:21 AM, Markus Spoettl <ms_li...@shiftoption.com> wrote:

>  up until now I've been assuming that CFUUIDCreateString() returns strings 
> using uppercase letters. There's lots of empirical evidence that it does do 
> that, but nothing in writing.

That doesn't seem like a safe assumption to make. (CFUUID has changed format at 
least once in the past, IIRC.) If you're using a UUID in a context that can't 
handle lowercase, I would manually convert it to uppercase first, just to make 
sure.

—Jens
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