updateAttributes function doesn't update the revision number

This function should take care of updating the _rev property in the instance after updating the document in the DB. 2 updates in a row of the same document fails with the current implementation.

Look for the updateAttributes function in the codebase, likely in a model or adapter layer. Check how it handles the _rev property for databases that use revision numbers (like CouchDB/Cloudant). The issue states two consecutive updates fail, so examine the update flow and where the revision is set after a DB write. Running existing tests for update operations might reveal the failure.

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