How do I make 'sizedupe:' more precise?

[HASJ]

Or what is the criteria for a detection with that option? Because it lists files that have no duplicates and I do not understand.

[therube]

viewtopic.php?p=30530#p30530

There are also posts (search) about exporting a sizedupe: list to a .efu, then opening that .efu & filtering based upon that...