How does Auto Weld treat welded colliders?

I’ve spent about 15 minutes trying to find documentation or a question on this but I don’t seem to be coming up with anything.

I am curious as to whether the Auto Weld option for physics collision generates a single mesh collider for physics queries or if it just checks each individual collider when doing physics queries?
This will be especially useful to know for cases where I am using primitive meshes that are always auto-welded.

EDIT: I would also like to know how auto-weld works with colliders that overlap - does this cause issues? I know for multiple colliders on a static mesh the Static Mesh Pipeline states to ensure there is a space between colliders.

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