2.5.2. Combining Data of Different Types
Exercise 2.84

Successive raising

Using the raise operation of exercise 2.83, modify the apply-generic procedure so that it coerces its arguments to have the same type by the method of successive raising, as discussed in this section. You will need to devise a way to test which of two types is higher in the tower. Do this in a manner that is ''compatible'' with the rest of the system and will not lead to problems in adding new levels to the tower.

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