alt Hacker Newsah, that's a good point.
perhaps use .ll.jxl to indicate "lossless jpegxl" informally?
prior art: I've been using .frontmatter.md or .fm.md for markdown files with frontmatter
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Levitating • today at 2:11 PM
Multiple extensions typically denote nested filetypes.
Like files.tar.xz may be decompressed with xz and then extracted with tar to get the directory "files".
I think in your case .md.fm would be a greater fit, as the front matter is read first. Or just .fmd
I've been wishing for years that all of these codecs with hybrid lossless/lossy modes would just add a single l to their file extensions, purely for the annoyance of it.
Like, you can do this individually, but it's not the same thing as actually having it in the standard.