adding another disk to an existing vdev

[tech-lists]

Hi,

Say there are 4 identical disks in total. Three of them are in an
already-existing raidz1-0 vdev.

Can I add this fourth disk to the vdev? Will it still be a raidz1-0
vdev?

Will I need to eg resilver/scrub/anything else ?

There are some answers for this question being "no" but these are from a
decade ago. Is it possible now?

Context is recent stable/12. The context can be changed if required.

thanks,
-- 
J.
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