AFAIK, NSDictionary specifies that it COPIES keys, and RETAINS
objects. Thus even if you were to use an NSMutableString as a key, you
could not mutate the key in the NSDictionary. So the only way you are
likely to get into trouble with keys is if you do troublesome things
like use oddball mutable-only object types (or immutable collections
with mutable content objects, or objects with mutable properties) as
dictionary _keys_.
So don't do that.
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