If the result of any computation would be a complex number whose real part is of type rational and whose imaginary part is zero, the result is converted to the rational which is the real part. This rule does not apply to complex numbers whose parts are floats. For example, #C(5 0) and 5 are not different objects in Common Lisp (they are always the same under eql); #C(5.0 0.0) and 5.0 are always different objects in Common Lisp (they are never the same under eql, although they are the same under equalp and =).
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