Checks that the type of ``value`` is correct as well as validating
            the elements of value

def validate_unwrap(self, value, session=None):
        ''' Checks that the type of ``value`` is correct as well as validating
            the elements of value'''
        self._validate_unwrap_type(value)
        self._length_valid(value)
        for v in value:
            if self.has_autoload:
                self._validate_child_unwrap(v, session=session)
            else:
                self._validate_child_unwrap(v)