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With normal Smalltalk code, I would explore the system using senders, implementors, inspectors— gradually rebuilding my understanding. Here, that breaks down. The matching syntax lives inside strings, invisible to standard navigation tools. No code completion. No refactorings. No help from the environment.
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The 473x series was such a flop that it is hard to even figure out the model
Cash handling is fraught with peril. Bills are fairly small and easy to hide,