[[!comment format=mdwn
 username="psxvoid"
 avatar="http://cdn.libravatar.org/avatar/fde068fbdeabeea31e3be7aa9c55d84b"
 subject="update 4: union is correct"
 date="2024-12-20T07:27:43Z"
 content="""
After even closer inspection, `_` works as expected indeed.

The reason why I was confused is that some folders with `tag-b` were appearing in `_` because this folder was containing `.jpg.jpg` probably produced by accident or are thumbnails generated by some app.
"""]]
