Using static NSString as observation context

FROM : Christiaan Hofman
DATE : Sat May 17 15:59:08 2008

I have recently changed some KVO observation code to us a static 
NSString as the context when registering as KVO observation. However 
now that seems to have introduced a crasher when removing the 
observer, at least on a Core Duo Intel machine. PPC does not seem to 
have any problem. So is there some problem using NSStrings as 
observation context for Intel? The Sketch sample code also uses those.

Christiaan