src/Filter/ClassFilter.php
private function getOperator($type)
    {
        $choices = [
            EqualType::TYPE_IS_EQUAL => 'INSTANCE OF',
            EqualType::TYPE_IS_NOT_EQUAL => 'NOT INSTANCE OF',
        ];

        return $choices[$type] ?? false;
    }
private function getOperator($type)
    {
        $choices = [
            EqualType::TYPE_IS_EQUAL => 'INSTANCE OF',
            EqualType::TYPE_IS_NOT_EQUAL => 'NOT INSTANCE OF',
        ];

        return $choices[$type] ?? false;
    }
@param int $type

@return mixed