RAM ZFS pool
This is an experiment; not a recommendation or advice.
It's probably not efficient to have a temporary ZFS pool on top of a RAM disk.
After all the ZFS ARC and L2ARC are very efficient intermediate caches.
Anyway, it's possible to define a temporary ZFS pool on top of a RAM disk.
Perhaps (still have to check) I could disable ARC and L2ARC.
It's also possible that this ZFS pool be encrypted.
At this point, perhaps I could have a case to justify this idea.
But I'm not recommending nor advising anything.
For now, I'm just exploring technologies.