`iset-partition``predicate``iset`procedureReturns two values: a newly allocated iset that contains just the elements of

*iset*that satisfy*predicate*and another newly allocated iset that contains just the elements of*iset*that do not satisfy*predicate*.Example:

(let-values (((low high) (iset-partition (lambda (x) (< x 6)) (iset 2 3 5 7 11)))) (list (iset->list low) (iset->list high))) ⇒ ((2 3 5) (7 11))