What does Robocopy mean by tweaked, lonely, and extra?

The Robocopy documentation for the option /it is simply “Includes ‘tweaked’ files”. What does “tweaked” mean?

The Robocopy documentation for the option /xl is simply “Excludes ‘lonely’ files and directories”. What does “lonely” mean?

“Tweaked”:

A Tweaked file is defined to be one that exists in both the source and destination, with identical size and timestamp, but different attribute settings.

“Lonely”:

A “lonely” file is present in source but not destination; excluding lonely will prevent any new files being added to the destination.

“Extra” (the other one that isn’t explained well):

An “extra” file is present in destination but not source; excluding extras will prevent any deletions from the destination.

Source: What does Robocopy mean by tweaked, lonely, and extra? – Super User