This is primarily a bugfix release, but it may also introduce breaking changes if you relied on a previously broken implementation. See https://mongoengine-odm.readthedocs.io/upgrade.html before upgrading.

• POTENTIAL BREAKING CHANGE: Fixed limit/skip/hint/batch_size chaining #1476
• POTENTIAL BREAKING CHANGE: Changed a public QuerySet.clone_into method to a private QuerySet._clone_into #1476
• Fixed the way Document.objects.create works with duplicate IDs #1485
• Fixed connecting to a replica set with PyMongo 2.x #1436
• Fixed using sets in field choices #1481
• Fixed deleting items from a ListField #1318
• Fixed an obscure error message when filtering by field__in=non_iterable. #1237
• Fixed behavior of a dec update operator #1450
• Added a rename update operator #1454
• Added validation for the db_field parameter #1448
• Fixed the error message displayed when querying an EmbeddedDocumentField by an invalid value #1440
• Fixed the error message displayed when validating unicode URLs #1486
• Raise an error when trying to save an abstract document #1449