What does requestedOcclusionPreferenceMode do?

I noticed this variable that exists on the `AROcclusionManager` called `requestedOcclusionPreferenceMode`, I'm confused as to the behavior of this on ARKit and ARCore. The options are: `PreferEnvironmentOcclusion` and `PreferHumanOcclusion`.

Are my assumptions correct:
On ARCore:
`PreferHumanOcclusion`- This will no-op since there is no human occlusion
`PreferEnvironmentOcclusion`- If supported will show the depth from the depth API in the camera

On ARKit:
`PreferHumanOcclusion`- This will do the human occlusion
`PreferEnvironmentOcclusion`- If supported (iPad w/ LiDAR) will show the depth from the depth camera on the camera

Does this mean with ARKit there is no way to mix the two occlusion modes? Or do I need the ARMeshManager for environmental occlusion on iOS?