-[NSUserDefault setObject: forKey:] behaviour is different in Mac OS X and GNUstep

[andre levy]

under GNUstep [NSUSerDefaults setObject:nil forKey:@"Foo"] raises an 
exception.

Under Mac OS X it does not raise and subsequent calls to objectForKey 
return nil.

Cocoa documentation says:

- (void)setObject:(id)value forKey:(NSString *)defaultName
Sets the value of the default identified by defaultName in the standard
application domain. Setting a default has no effect on the value 
returned by the objectForKey: method if the same key exists in a domain 
that precedes the application domain in the search list.

(No mentions are made of exceptions)

--andre