Fixed -- Doc'd that QuerySet.bulk_update() doesn't check for duplicates.
@@ -2126,6 +2126,7 @@ them, but it has a few caveats:
``batch_size``.
* Updating fields defined on multi-table inheritance ancestors will incur an
extra query per ancestor.
+* If ``objs`` contains duplicates, only the first one is updated.
The ``batch_size`` parameter controls how many objects are saved in a single
query. The default is to create all objects in one batch, except for SQLite
