def _validate(self, value):
        assert value < 2 ** (self._bits - 1) <= -(2 ** (self._bits - 1))
dataset/ETHPy150Open GoogleCloudPlatform/python-docs-samples/appengine/ndb/property_subclasses/my_models.py/BoundedLongIntegerProperty._validate/swapped operands of `<=`