Added assert() to base library

also fixed regression in call()

src/cobj.h

@@ -64,7 +64,7 @@ typedef struct CObjFunction {
     CChunk chunk;
     int args;
     int upvals;
-    int variadic;
+    bool variadic;
     CObjString *name;
     CObjString *module; // name of the "module"
 } CObjFunction;