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* **Breakage**: Certain queries may now require you to specify an index where it was auto-detected before
* Feature: Queries can now filter on non-indexed fields
* Feature: More powerful "sync-if" constraints
* Feature: Can OR together filter constraints in queries
All changes are due to an `update in the DynamoDB API
<http://aws.amazon.com/blogs/aws/improved-queries-and-updates-for-dynamodb/>`_