Thanks Mr Lundman for keeping old builds up!
Here's what I've found in my brief trials (tested only mount/unmount, read/write):
- 10.11 and 10.14: ok
- 10.9 : still no automount (a bunch of "Throttling respawn: Will start in x seconds" in Console at startup) ; manual mount and unmount ok (but message in Finder "unreadable disk" although it looks like working ok).
N.B.: my test zpool have been created with v2.1.6, where it behaved about the same.