read a .we minetest schema

- use ground has maze walls

java/org/artisanlogiciel/lua/LuaTuple.java

@@ -22,8 +22,8 @@ public class LuaTuple
 
     public String addInMap(HashMap<String,Object> map)
     {
-        String key = items.get(0).toString();
-        Object value = items.get(1);
+        String key = (String) items.get(0).wrapToJava();
+        Object value = items.get(1).wrapToJava();
 
         map.put(key,value);