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This fixes the "Deprecated: Return type of `CountableFake::count()` should be compatible with `Countable::count(): int`" warning on PHP 8.1. PHP native interfaces now have declared return types and methods in classes implementing these interfaces need to either have the return type declared (in a covariant compatible manner with the PHP native interface method declaration), or need to silence the deprecation warning using the `#[ReturnTypeWillChange]` attribute. Follow-up to [51517], [51529], [51530], [51531], [51532]. Props jrf. See #53635. git-svn-id: https://develop.svn.wordpress.org/trunk@51594 602fd350-edb4-49c9-b593-d223f7449a82