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* feature:DynamoDB: Add request auto de-duplication based on specified primary keys for batch_writer. (`605 <https://github.com/boto/boto3/issues/605>`__)
* feature:s3: Add managed file-like object uploads to S3 client, Bucket, and Object.
* bugfix:Session: Fixed Session.__repr__ region argument name.
* feature:s3: Add managed copies to S3 client, Bucket, and Object.
* feature:s3: Add managed downloads to file-like objects in the S3 client, Bucket, and Object.
* bugfix:s3: Port ``s3.transfer`` module to use ``s3transfer`` package. Please refer to `Upgrading Notes <https://boto3.amazonaws.com/v1/documentation/api/latest/guide/upgrading.html>`_ when upgrading. In porting the logic over, various performance issues and bugs were fixed.
* feature:s3: Add ``io_chunksize`` parameter to ``TransferConfig``