def get(self, block, name):
        """
        Retrieve the value for the field named `name`.

        If a value is provided for `default`, then it will be
        returned if no value is set
        """
        return self._kvs.get(self._key(block, name))
Retrieve the value for the field named `name`.

        If a value is provided for `default`, then it will be
        returned if no value is set