There were a couple of (iirc read-only) beta ZFS PKGs from Apple in the 10.5 era...

		Lammy 10 months ago \| parent \| context \| favorite \| on: Apple’s Darwin OS and XNU Kernel Deep Dive There were a couple of (iirc read-only) beta ZFS PKGs from Apple in the 10.5 era: https://macintoshgarden.org/forum/looking-zfs-beta-seeds-ye-...