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re: define and set! with multiple-values

>As a programmer I like and enjoy multiple return values, it would be
>sad to see them go.  The one time I listen in on the implementation of
>multiple return values in Lisp they added an amazing amount of
>confusion to the design meetings about function calling.  The time
>spent on that complexity would have bought lots of cool valuable

Concerning the use of multiple return values, I've always wondered
what is the difference concerning returning multiple values and returning
a list (or a collection class object). In other words can't the programmer
already control the return statements?