Remove instanceof check in dynamodb-doc
Remove instanceof check in dynamodb-doc

awslabs/dynamodb-document-js-sdk,AfterShip/dynamodb-document-js-sdk,AfterShip/dynamodb-document-js-sdk,STRd6/dynamodb-document-js-sdk,STRd6/dynamodb-document-js-sdk,awslabs/dynamodb-document-js-sdk