Improved performance by inserting thitherto missing `copy` argument.

Made get_axes_local_distribution_strategy more robust.

d2o/distributor_factory.py

@@ -1034,7 +1034,8 @@ class _slicing_distributor(distributor):
             if isinstance(data_update, distributed_data_object):
                 selected_update = data_update.get_data(
                                  key=update_slice,
-                                 local_keys=True)
+                                 local_keys=True,
+                                 copy=copy)
                 local_data_update = selected_update.get_local_data(copy=False)
                 local_data_update = local_data_update.astype(self.dtype,
                                                              copy=False)
@@ -1992,7 +1993,12 @@ class _slicing_distributor(distributor):
 
     def get_axes_local_distribution_strategy(self, axes):
         if 0 in axes:
-            return self.distribution_strategy
+            if self.distribution_strategy in STRATEGIES['local']:
+                raise ValueError(about_cstring(
+                    "ERROR: axes_local_distribution_strategy is not uniquely "
+                    "defined for local-type distribution strategies."))
+            else:
+                return self.distribution_strategy
         else:
             return 'not'