Class % of programs needing <integer> 95.0 <single-float> 75.0 <double-float> 10.0 <ratio> 5.0 <rectangular-complex> 2.0 <extended-float> 0.1 In fact, i'd be quite happy if Dylan only had <integer> and <single-float>, even if some would consider this a "half-baked" numerical system. k