I'm pretty sure that's what NSLiteralSearch does. In practice for me, I found 
the difference is that composed/decomposed character sequences are scene as 
being the same when using compare with no options, but that there's a 
difference when using NSLiteralSearch (and by extension, -isEqualToString:)

On 16 Aug 2011, at 17:44, Jens Alfke wrote:

> Anyone know what the exact behavior of NSLiteralSearch is when calling 
> -[NSString compare:options:]?
> 
> I need to sort an array of NSStrings, with the ordering based on a raw 
> comparison of UTF-16 character values*. That is, sorting the strings as 
> though they were just arrays of UInt16, instead of using any kind of Unicode 
> smarts or locale-specific settings. It sounds as though NSLiteralSearch does 
> that, but the docs don’t actually spell it out.
> 
> —Jens
> 
> * Why? To produce canonicalized JSON. See 
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