If it looks -- e.g. in an object explorer -- like a dictionary, you should be
able to talk to it like one. If #at:put: offers no meaningful
implementation, throw a descriptive exception. Raising a generic DNU/MNU in
such a case may confuse the tool/application developer and hence may repeat
such a discussion over and over again. :)

If, some day, we will find a meaningful/safe implementation/semantic for
#at:put:, just provide it and stop raising and exception.

Best,
Marcel



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