ing new procedures and syntactic
forms: <tt>letrec*</tt>, <tt>let-values</tt>, <tt>let*-values</tt>, <tt>real-valued?</tt>, <tt>rational-valued?</tt>, <tt>integer-valued?</tt>, <tt>exact</tt>, <tt>inexact</tt>, <tt>finite?</tt>, <tt>infinite?</tt>, <tt>nan?</tt>,
<tt>div</tt>, <tt>mod</tt>, <tt>div-and-mod</tt>, <tt>div0</tt>, <tt>mod0</tt>, <tt>div0-and-mod0</tt>, <tt>exact-integer-sqrt</tt>, <tt>boolean=?</tt>, <tt>symbol=?</tt>, <tt>string-for-each</tt>, <tt>vector-map</tt>, <tt>vector-for-each</tt>, <tt