range-length -- r7rs Type exact-integer-positive-or-zero;integer-positive-or-zero;rational-positive-or-zero;real-positive-or-zero-not-inf;number-positive-or-zero-not-inf;number-positive-or-zero;number-not-nan;number;number-not-inf;real-positive-or-zero;real-not-nan;complex-not-nan;complex;real;real-not-inf;complex-not-inf;rational;real-not-inf-not-nan;complex-not-inf-not-nan;number-not-inf-not-nan;integer;exact-integer;exact-rational;exact-real;exact-complex;exact-number;