loreq(KurumiValue other) { return(other.gthan_number(this).negation()); }
gthan(KurumiValue other) { return(other.gthan_number(this)); }
loreq(KurumiValue other) { return(other.gthan_number(this).negation()); }
gthan(KurumiValue other) { return(other.gthan_number(this)); }