Fix for mixed type values

src/engine/objects/ItemTemplate.java

@@ -169,8 +169,8 @@ public class ItemTemplate {
 
             for (Object key : obj_sparse_json.keySet()) {
                 String sparseType = (String) key;
-                String sparseValue = (String) obj_sparse_json.get(sparseType);
-                obj_sparse_data.put(sparseType, sparseValue);
+                Object sparseValue = obj_sparse_json.get(sparseType);
+                obj_sparse_data.put(sparseType, sparseValue.toString());
             }
 
             // Reading float values
@@ -499,8 +499,8 @@ public class ItemTemplate {
 
                 for (Object key : rune_sparse_json.keySet()) {
                     String sparseType = (String) key;
-                    String sparseValue = (String) rune_sparse_json.get(sparseType);
-                    rune_sparse_data.put(sparseType, sparseValue);
+                    Object sparseValue = rune_sparse_json.get(sparseType);
+                    rune_sparse_data.put(sparseType, sparseValue.toString());
                 }
 
                 JSONArray attr_adj_json = (JSONArray) jsonObject.get("rune_attr_adj");