/etc/zfs/zsysctl.conf not loaded after installation (v2.2.3rc4)?

[Haravikk]

System information

Type	Version/Name
Distribution Name	macOS
Distribution Version	10.15.7
Linux Kernel	Darwin Kernel Version 19.6.0
Architecture	x86_64
ZFS Version	zfs-macOS-2.2.3-rc4

Describe the problem you're observing

After installing a newer version of ZFS, all tunables are set to defaults, as the content of /etc/zfs/zsysctl.conf does not appear to be loaded afterwards.

This is not the case for v2.1.0, which loads the contents of /etc/zfs/zsysctl.conf immediately after installation.

Describe how to reproduce the problem

1. Configure some customised settings in /etc/zfs/zsysctl.conf, e.g- a custom value for kstat.zfs.darwin.tunable.zfs_arc.max.
2. Install a new version of ZFS using one of the macOS installer packages.

Additional Information

I'm aware that some tunables have changed in later versions of ZFS, which is why my /etc/zfs/zsysctl.conf looks like:

kstat.zfs.darwin.tunable.zfs_arc_max=12884901888
kstat.zfs.darwin.tunable.zfs_arc.max=12884901888

kstat.zfs.darwin.tunable.zfs_dirty_data_max=6442450944
kstat.zfs.darwin.tunable.zfs.dirty_data_max=6442450944

This is to maintain compatibility with v2.1.0 which uses the older form of each of these (zfs_ rather than zfs., and zfs_arc_ rather than zfs_arc.).