Firestore SnapshotTrait::getSnapshot() Timestamp inconsistency

[yash30201]

Environment details

• OS:Linux
• PHP version:8.1

Steps to reproduce

Simply try to fetch a DocumentSnapshot with readTime parameter in firestore.

Code example

use Google\Cloud\Core\Timestamp;
$readTime = new Timestamp(new \DateTimeImmutable());
$document = $firestoreClient->document('your-document-name');
$snapshot = $document->snapshot(['readTime' => $readTime]);

Doing the above results in error: Google.Protobuf.Timestamp expected error from backend.

if we try to supply Google\Protobuf\Timestamp, then we get a client level exception from getSnapshot() method saying Google\Cloud\Core\Timestamp expected.

Bug

Thus right now it's not possible to use readTime parameter in getSnapshot method in client library.