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Localized string compare

From: Jens Alfke
Subject: Localized string compare
Date: Thu, 1 Mar 2012 13:47:56 -0800

Looks like localized string comparison (-[NSString localizedCompare:], et al) 
isn’t implemented — NSString.m has various reminder comments like “Should 
implement full POSIX.2 collate” and "FIXME: This does only a normal compare, 
ignoring locale”.

Unfortunately Unicode collation is kind of important for my app, as its data 
interchange format relies on a single cross-platform sort order for strings.

How hard would it be to implement this? Does it mean calling into the scary 
innards of ICU, or is there some higher level collation API available?


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