Load a value as a list, converting items if necessary

def to_native(self, value):
        """Load a value as a list, converting items if necessary"""
        if isinstance(value, six.string_types):
            value_list = value.split(self.string_delim)
        else:
            value_list = value

        to_native = self.member_type.to_native if self.member_type is not None else lambda x: x
        return [to_native(item) for item in value_list]