diff --git a/lang/func.c b/lang/func.c
index eddaa4d..464accf 100644
--- a/lang/func.c
+++ b/lang/func.c
@@ -20,12 +20,7 @@
 	return (Object)func;
 }
 
-static void func_cleanup(Object obj) {
-	abort_if(obj->class_data != &func_class,
-		"func_cleanup obj is not a func");
-	struct func *func = (struct func *)obj;
-	free(func);
-}
+static void func_cleanup(Object obj) { free(obj); }
 
 static void func_call(VmState state, Object obj) {
 	(void)obj;
diff --git a/lang/number.c b/lang/number.c
index 6d96478..f904f66 100644
--- a/lang/number.c
+++ b/lang/number.c
@@ -21,13 +21,7 @@
 	return (Object)num;
 }
 
-static void number_cleanup(Object obj) {
-	abort_if(obj == NULL, "number_cleanup obj is NULL");
-	abort_if(obj->class_data != &num_class,
-		"number_cleanup obj is not a number");
-	struct number *num = (struct number *)obj;
-	free(num);
-}
+static void number_cleanup(Object obj) { free(obj); }
 
 int number_value(Object obj) {
 	abort_if(obj->class_data != &num_class,