use deepcopy in copyData

Lib/fontParts/base/base.py

@@ -216,8 +216,7 @@ def copyData(self, source):
             if isinstance(selfValue, BaseObject):
                 selfValue.copyData(sourceValue)
             else:
-                setattr(self, attr, sourceValue)
-
+                setattr(self, attr, deepcopy(sourceValue))
     # ----------
     # Exceptions
     # ----------
@@ -832,10 +831,10 @@ def _setIdentifier(self, value):
 def reference(obj):
     """
     This code returns a simple function that returns the given object.
-    This is a backwards compatibility function that is under review. 
-    See #749. We used to use weak references, but they proved 
-    problematic (see issue #71), so this function was put in place to 
-    make sure existing code continued to function. The need for it is 
+    This is a backwards compatibility function that is under review.
+    See #749. We used to use weak references, but they proved
+    problematic (see issue #71), so this function was put in place to
+    make sure existing code continued to function. The need for it is
     questionable, so it may be deleted soon.
     """
     def wrapper():