OK so the KEXT version requirements was a hassle, so for now, the version in kext will not change with rc releases,
but macOS appears to understand newer versions without a version bump.
After installing, make sure "zpool version" reports:
zfs-macOS-2.1.6-3_g84dbe5990
zfs-kmod-2.1.6-3_g84dbe5990
The "-3" in this case is rc3.
Skipping rc2 just to avoid the confusion.
* Word is, Mac Studio + Ventura + ZFS will not boot. Cause unknown.
* zpool-import-all.sh does not get installed! (but might exist from old installs) -> rc4
NEW Ventura (wasn't compiled with -O2)
Unchanged (was using -O2)