number-negative-or-zero -- r7rs Type number-zero;complex-zero;real-zero;rational-zero;integer-zero;exact-integer-zero;number-negative-not-inf;real-negative;real-negative-not-inf;rational-negative;integer-negative;exact-integer-negative;real-negative-or-zero-not-inf;rational-negative-or-zero;integer-negative-or-zero;exact-integer-negative-or-zero;range-length-zero;(lambda (value) (and (number? value) (or (negative? value) (zero? value))))