added copy for bool

src/model/data.py

@@ -15,7 +15,12 @@ def copy(parent):
     elif type(parent) is list:
         return [copy(i) for i in parent]
     
-    elif type(parent) is int or type(parent) is float or type(parent) is str or parent is None:
+    elif type(parent) is int or \
+         type(parent) is float or \
+         type(parent) is str or \
+         type(parent) is bool or \
+         parent is None:
+             
         return parent
     
     else: