The MongoDB\Driver\CursorID class is a value object
that represents a cursor ID. Instances of this class are returned by
MongoDB\Driver\Cursor::getId().
Warning
This class has been DEPRECATED as of extension
version 1.20.0 and was removed in 2.0. Applications have to update their
usage of MongoDB\Driver\Cursor::getId() to return
MongoDB\BSON\Int64 instead.