On 28 Jul 2014, at 4:57 PM, Peter Geoghegan wrote:
> [....] Then
> again, who knows? The Mac OS X behavior seems totally arbitrary to me.
> If I had to guess I'd say it has something to do with their providing
> an open standard shim to a UTF-16 based proprietary API.

A quick glance at OSX's strxfrm() suggests they're using an implementation of 
strxfrm() from FreeBSD. You can find the source here:

    
http://www.opensource.apple.com/source/Libc/Libc-997.90.3/string/FreeBSD/strxfrm.c

(and a really quick glance at the contents of libc on OSX 10.9 reinforces 
this--- I don't see any calls into their CoreFoundation unicode string APIs.)





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