31.5.3 Genericity of arithmetic procedures

By default, arithmetic procedures are generic. This means that it is allowed to use them with flonum and fixnum. This feature, of course, implies performances penalty. To improve performance, you may use specialized procedures (such as +fx, =fx, … or +fl, =fl, …) but, it is possible to suppress the genericity and to make all generic arithmetic procedures (= for example) fixnum ones. For this you must use the compiler option -farithmetic, or add the following module clause (option (set! *genericity* #f)) in your module declaration.

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