File should not depend on the Title class, to reduce coupling and avoid circular dependencies. As a first step, it would be sufficient to remove all usages of Title in the public interface of File and FileRepo, while resorting to downcasts to obtain a Title instance where necessary in the implementation. All usages of Title in File and FileRepo should however be considered technical debt.

Special care must be taken when introducing cross-wiki awareness into classes used to access files on other wikis, such as ForeignDBFile or ForeignAPIFileRepo. While we should make use of the cross-wiki functionality in PageIdentity and LinkTarget, existing code that relies on the Title class must remain functional when using a Title in the context of another wiki.