12.10.4 Exact integers decrement

Unsafe Operation: $sub1-integer N

Decrement by 1 the fixnum or bignum N and return the result.

Unsafe Operation: $sub1-bignum N

Decrement by 1 the bignum N and return the result.

Unsafe Operation: $sub1-fixnum N

Decrement by 1 the fixnum N and return the result.