Database::executePartitionedUpdate() returns string instead of int

[taka-oyama]

When I updated from 1.75.1 to 1.76.0 the returned value changed from int to string.
PhpDoc says it should return int.

Environment details

• OS: Alpine Linux 3.18
• PHP version: 8.2.18
• Package name and version: cloud-spanner v1.76.0

Steps to reproduce

1. Run Database::executePartitionedUpdate()
2. dump result

Code example

$instanceId = getenv('SPANNER_INSTANCE');
$databaseId = getenv('SPANNER_DATABASE');

$client = new SpannerClient();
$database = $client->connect($instanceId, $databaseId);
$database->create(['statements' => [
    'CREATE TABLE `Test` (`id` STRING(36) NOT NULL, `text` STRING(MAX)) PRIMARY KEY (`id`)'],
])->pollUntilComplete();

$statement = "UPDATE `Test` SET `text` = @p0 WHERE `text` = @p1";
$parameters = ['p0' => 'after', 'p1' => 'before'];
$result = $database->executePartitionedUpdate($statement, ['parameters' => $parameters]);
var_dump($result);  // string(1) "0"