OpenZFS on OS X 1.4.5 mountpoint on pre-release 10.11.4

sh-3.2$ date ; sw_vers ; kextstat | grep -i zfs
Wed  9 Mar 2016 08:00:18 GMT
ProductName:	Mac OS X
ProductVersion:	10.11.4
BuildVersion:	15E61b
  153    1 0xffffff7f80ab3000 0x239000   0x239000   net.lundman.zfs (1.4.5) 2C314A44-1884-375C-8B48-F682EDD16B4E <152 16 7 5 4 3 1>
sh-3.2$ zpool status
  pool: macbookpro82
 state: ONLINE
  scan: none requested
config:

	NAME                                          STATE     READ WRITE CKSUM
	macbookpro82                                  ONLINE       0     0     0
	  media-498DCFA6-DF98-11D4-AFA9-3C07544065DB  ONLINE       0     0     0

errors: No known data errors
sh-3.2$ zfs mount
sh-3.2$ zfs list
NAME                        USED  AVAIL  REFER  MOUNTPOINT
macbookpro82               3.99G   109G    96K  none
macbookpro82/ROOT          3.97G   109G    96K  none
macbookpro82/ROOT/initial  3.97G   109G  3.97G  /mnt
macbookpro82/tmp            524K   109G   524K  /tmp
macbookpro82/usr            576K   109G    96K  none
macbookpro82/usr/home        96K   109G    96K  /usr/home
macbookpro82/usr/jails       96K   109G    96K  /usr/jails
macbookpro82/usr/obj         96K   109G    96K  /usr/obj
macbookpro82/usr/ports       96K   109G    96K  /usr/ports
macbookpro82/usr/src         96K   109G    96K  /usr/src
macbookpro82/var           13.1M   109G    96K  none
macbookpro82/var/audit      500K   109G   500K  /var/audit
macbookpro82/var/log       11.6M   109G  11.6M  /var/log
macbookpro82/var/mail       496K   109G   496K  /var/mail
macbookpro82/var/tmp        464K   109G   464K  /var/tmp
sh-3.2$ zfs get mountpoint macbookpro82/var/log
NAME                  PROPERTY    VALUE       SOURCE
macbookpro82/var/log  mountpoint  /var/log    local
sh-3.2$ ls -@aelR /mnt/huh
total 0
drwxr-xr-x  2 root  wheel   68  9 Mar 07:52 .
drwxr-xr-x  3 root  wheel  102  9 Mar 07:52 ..
sh-3.2$ sudo zfs mount -o mountpoint=/mnt/huh macbookpro82/var/log
Password:
sh-3.2$ zfs mount
macbookpro82/var/log            /private/var/log
sh-3.2$ sudo zfs unmount macbookpro82/var/log
Running process: '/usr/sbin/diskutil' 'unmount' '/private/var/log'
Unmount failed for /private/var/log
cannot unmount '/private/var/log': umount failed
sh-3.2$ sudo zfs unmount -f macbookpro82/var/log
Running process: '/usr/sbin/diskutil' 'unmount' 'force' '/private/var/log'
Unmount successful for /private/var/log
sh-3.2$ zfs mount
sh-3.2$ sudo launchctl unload -w /Library/LaunchDaemons/org.openzfsonosx.zpool-import-all.plist
sh-3.2$ date
Wed  9 Mar 2016 08:18:56 GMT
sh-3.2$ sudo zfs mount -o mountpoint="/mnt/huh" macbookpro82/var/log
Password:
sh-3.2$ zfs mount
macbookpro82/var/log            /private/var/log
sh-3.2$ sudo zfs unmount -f macbookpro82/var/log
Running process: '/usr/sbin/diskutil' 'unmount' 'force' '/private/var/log'
Unmount successful for /private/var/log
sh-3.2$ ls -l /var
lrwxr-xr-x@ 1 root  wheel  11  4 Nov 02:17 /var -> private/var
sh-3.2$