Simplified Equality

object/null.go

@@ -5,16 +5,18 @@ type Null struct{}
 func (n *Null) Type() ObjectType {
 	return NULL_OBJ
 }
+
 func (n *Null) Inspect() string {
 	return "null"
 }
+
 func (n *Null) String() string {
 	return n.Inspect()
 }
-func (n *Null) Equal(other Object) bool {
-	_, ok := other.(*Null)
-	return ok
-}
-func (n *Null) Less(other Object) bool {
-	return false
+
+func (n *Null) Compare(other Object) int {
+	if _, ok := other.(*Null); ok {
+		return 0
+	}
+	return 1
 }