Regarding the empty string and binary values: https://aws.amazon.com/about-aws/whats-new/2020/05/amazon-dynamodb-now-supports-empty-values-for-non-key-string-a

Regarding the empty string and binary values: https://aws.amazon.com/about-aws/whats-new/2020/05/amazon-dynamodb-now-supports-empty-values-for-non-key-string-and-binary-attributes-in-dynamodb-tables/ https://aws.amazon.com/about-aws/whats-new/2020/05/amazon-dy... (Disclosure: I work for AWS on DynamoDB and on this)