`iset-unfold``stop?``mapper``successor``seed`procedureCreate a newly allocated iset as if by

`iset`. If the result of applying the predicate*stop?*to*seed*is true, return the iset. Otherwise, apply the procedure*mapper*to*seed*. The value that*mapper*returns is added to the iset. Then get a new seed by applying the procedure*successor*to*seed*, and repeat this algorithm.Examples:

(iset->list (iset-unfold (lambda (n) (> n 64)) values (lambda (n) (* n 2)) 2)) ⇒ (2 4 8 16 32 64)