xo-interpreter: expose builtin primitives to interpreter

xo-object/include/xo/object/ObjectConversion.hpp

@@ -14,6 +14,16 @@ namespace xo {
             static gp<Object> to_object(gc::IAlloc * mm, const T & x) = delete;
             static T from_object(gc::IAlloc * mm, gp<Object> x) = delete;
         };
+
+        /** see specializations:
+         *    ObjectConversion<bool>
+         * in object/Boolean.hpp
+         *
+         *    ObjectConversion<int64_t>
+         *    ObjectConversion<int32_t>
+         *    ObjectConversion<int16_t>
+         * in object/Integer.hpp
+         **/
     }
 }