Quote: most object-oriented systems use single dispatching; i.e., a message is sent to one object; e.g., "5+4" is 5.plus(4)

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Most object-oriented systems are based on single dispatching. … method that is invoked by the message. … one implication is that a binary expression such … [It may require duplication of code, e.g., for mixed integer and floating point arithmetic.]   Google-1   Google-2

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Quote: single dispatching does not match binary operations; e.g., possible code duplication for mixed integer and floating point arithmetic

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