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Multiple values for R4RS.
The predicate "accepts?" seems a little like the (rejected) predicate
"continuation?". A procedure may not complain "up front" about a given
number of arguments, but may complain at some later time. Or it may
accept any number of arguments, but ignore all but the first few. I
don't see how "accepts?" can be generally useful if it breaks down in
This is like saying that a given object may pass a PAIR? test yet when
given to a list operation, the operation will flame. Just because it
does not cover all cases, it does not mean that it is useless. Are
you advocating for removing PAIR? from the language?