Improved nested ArrayField example

            class ChessBoard(models.Model):

                board = ArrayField(

                    ArrayField(

                        CharField(max_length=10, blank=True, null=True),

                        size=8),

                    size=8)

                        models.CharField(max_length=10, blank=True),

                        size=8,

                    ),

                    size=8,

                )

        Transformation of values between the database and the model, validation

        of data and configuration, and serialization are all delegated to the