You can store an instance of a Serializable class as a Blob value. To tell Slim3 Datastore to serialize the value, the field uses
Here is an example of a simple Serializable class that represents a file, including the file contents, a filename and a MIME type.
To store an instance of a Serializable class as a Blob value in a
property, declare a field whose type is the class, and use the
Continue to Array of bytes.