Where do we have the boot-safe zfs-features documented?

From: Alexander Leidinger via fs <fs_at_freebsd.org>
Date: Tue, 21 Dec 2021 06:13:27 UTC
Hi,

I remember to have read somewhere which zfs-features are safe to use  
on a boot-pool, but I can't seem to find this anymore. Where do we  
have this documented (or where is the code which checks this?

Bye,
Alexander.

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