CAS parser should reject values with trailing garbage

$options = new Couchbase\ClusterOptions();

$options->credentials('username', 'password');

$cluster = new Couchbase\Cluster('couchbase://couchbase7.1', $options);

$collection = $cluster->bucket('test')->defaultCollection();

$key = 'key';

$collection->upsert($key, [$key => $key]);

$doc = $collection->get($key);

// The output is:

//     Array

//     (

//         [key] => key

//     )

echo print_r($doc->content(), true), PHP_EOL;

echo $doc->cas(), PHP_EOL;

// An invalid cas value is used here.

$options = Couchbase\RemoveOptions::build()->cas($doc->cas() . '-invalid');

$collection->remove($key, $options);

// The output should still be:

//     Array

//     (

//         [key] => key

//     )

try {

    print_r($collection->get($key)->content());

} catch (Couchbase\Exception\DocumentNotFoundException $e) {

    echo "This shouldn't be printed out.", PHP_EOL;

}