Flag indicating if the minimum value is inclusive or exclusive.

def maximumCanEqual(self):
        """Flag indicating if the minimum value is inclusive or exclusive."""
        if self.maximum is None:
            raise SchemaError("maximumCanEqual requires presence of maximum")
        value = self._schema.get("maximumCanEqual", True)
        if value is not True and value is not False:
            raise SchemaError(
                "maximumCanEqual value {0!r} is not a boolean".format(
                    value))
        return value