It's generally unwise to do this kind of thing if you're dealing with
class clusters or bridged classes (which category includes both
NSString and NSNumber). The class you actually get may not be what
you're expecting.
If you're doing it with your own classes, it's safer, but can be
fragile, since it's one more thing you're going to need to remember to
change if you change your inheritance hierarchy.
+Melissa
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