The key in which this value will be persisted in DynamoDB. If not
provided, the key will be assumed to be the same in the input and in the
persisted record.
Optional defaultProvider
defaultProvider:undefined | function
An optional default value factory. If a type has a defined
defaultProvider and its value is undefined in the provided input, the
defaultProvider will be called and its return value serialized.
The key in which this value will be persisted in DynamoDB. If not provided, the key will be assumed to be the same in the input and in the persisted record.