[freedomben]

Yep, btrfs will happily do this to you. I verified it the hard way

[kccqzy]

Well btrfs supports compression so that’s understandable. However I personally prefer to control compression manually so it only compresses files marked by me for compression using chattr(1).

[freedomben]

I've switched to that also. It surely wastes some space but being able to reason about file space is worth it to me for now