doctrine / mongodb-odm

            $options['unique'] = ('true' === (string) $attributes['unique']);

        }

        if (isset($xmlIndex->{'option'})) {

            foreach ($xmlIndex->{'option'} as $option) {

                $value = (string) $option['value'];

                if ($value === 'true') {

                    $value = true;

                } elseif ($value === 'false') {

                    $value = false;

                } elseif (is_numeric($value)) {

                    $value = preg_match('/^[-]?\d+$/', $value) ? (integer) $value : (float) $value;

                }

                $options[(string) $option['name']] = $value;

            }

        }

        if (isset($xmlIndex->{'partial-filter-expression'})) {

            $partialFilterExpressionMapping = $xmlIndex->{'partial-filter-expression'};

            $options['numInitialChunks'] = (int) $attributes['numInitialChunks'];

        }

        if (isset($xmlShardkey->{'option'})) {

            foreach ($xmlShardkey->{'option'} as $option) {

                $value = (string) $option['value'];

                if ($value === 'true') {

                    $value = true;

                } elseif ($value === 'false') {

                    $value = false;

                } elseif (is_numeric($value)) {

                    $value = preg_match('/^[-]?\d+$/', $value) ? (integer) $value : (float) $value;

                }

                $options[(string) $option['name']] = $value;

            }

        }

        $class->setShardKey($keys, $options);

    }