I'm a bit new to Cocoa, and I'm trying to get my head around NSDictionary. In
the Apple documentation it says, "Each entry consists of one object that
represents the key and a second object that is the key's value. ... In general,
a key can be any object, but note that when using key-value coding the key must
be a string."
So, I supply an object that *represents* the key, meaning that this object
itself is not the key, but it's value is? That makes sense for NSStrings, but
not if the key is some other object without an obvious "value", like an
NSArray.
Are the two key types somehow treated differently?
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