def unwrap(self, value, session=None):
        ''' Unwraps the elements of ``value`` using ``ListField.item_type`` and
            returns them in a list'''
        kwargs = {}
        if self.has_autoload:
            kwargs['session'] = session
        self.validate_unwrap(value, **kwargs)
        return [ self.item_type.unwrap(v, **kwargs) for v in value]
Unwraps the elements of ``value`` using ``ListField.item_type`` and
            returns them in a list