12.2.4 https://clisp.sourceforge.io/impnotes.html#num-concepts https://clisp.sourceforge.io/impnotes.html#num-concepts and http://www.lispworks.com/documentati

12.2.4 https://clisp.sourceforge.io/impnotes.html#num-concepts https://clisp.sourceforge.io/impnotes.html#num-concepts and http://www.lispworks.com/documentation/HyperSpec/Body/t_float.htm http://www.lispworks.com/documentation/HyperSpec/Body/t_floa... > In addition, there is a floating-point zero; depending on the implementation, there can also be a ``minus zero''. If there is no minus zero, then 0.0 and -0.0 are both interpreted as simply a floating-point zero. (= 0.0 -0.0) is always true. If there is a minus zero, (eql -0.0 0.0) is false, otherwise it is true.