6 files declare their use of Merge in Drupal 10

DatabaseStorage.php in core/lib/Drupal/Core/KeyValueStore/DatabaseStorage.php

Merge.php in core/modules/sqlite/src/Driver/Database/sqlite/Merge.php

Merge.php in core/modules/pgsql/src/Driver/Database/pgsql/Merge.php

Merge.php in core/modules/mysql/src/Driver/Database/mysql/Merge.php

Merge.php in core/tests/fixtures/database_drivers/module/corefake/src/Driver/Database/corefakeWithAllCustomClasses/Merge.php

MergeTest.php in core/tests/Drupal/KernelTests/Core/Database/MergeTest.php