How to disable all GEOM tasting?

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How to disable *all* GEOM tasting of newly-attached devices?  I looked
through the manuals, searched web, grepped sysctl -ad.  I only find
sysctl to disable all tasting for graid (kern.geom.raid.enable).

Example, if I have removable drive I want to pop in and access from
userland with open("/dev/foo0", O_RDONLY); without various GEOM
modules first trying to understand.

Thanks in advance for assistance.