What happens if GUI Metadata set to 0?

What happens if :
Metadata (Special) Small Block Size set to 0, in the GUI ?

Will metadata be stored on sVDEV and all data on VDEV ? or
will metadata and data be stored on VDEV and noting stored on sVED ?

Does the GUI give you any tool tips as to valid values or ranges?

Screenshot 2025-02-01 at 16.00.27

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