I am looking for a proper way to definitively check if an URL points to a file or a directory. Files should include filewrapped data like UIDocument using a FileWrapper to wrap its underlying structure.

I am aware of the fact that URLResourceValues allows checking for isDirectory and isRegularFile via

let resourceValues = try? url.resourceValues(forKeys: [.isRegularFileKey, .isDirectoryKey])
resourceValues?.isDirectory
resourceValues?.isRegularFile

But in the case of a filewrapped document with a directory substructure isDirectory would be true but isRegularFile would be false, so this does not help.

The one solution I could come up with is to use documentIdentifier like

let resourceValues = try? url.resourceValues(forKeys: [.documentIdentifierKey])
resourceValues?.documentIdentifier // non-nil if url points to file, nil otherwise

which works fine for me: documentIdentifier is nil for a directory and non-nil for a file.

So my question is: Is using URLResourceValues with documentIdentifier a proper solution for checking if an URL points to a file or a directory or is there a preferred way to do this?