prefab.deps — it is for?..

[U.N.Owen]

In every prefab file we can see something like this:

local prefabs = 
{
	-- list of prefabs that can be summoned by this prefab
}

In scripts/prefabs.lua this table is assigned to prefab.deps.

However, actually, unlisted prefabs can be summoned too. It usually used for dynamically add custom loot, etc. I used it and did't notice any difference.

So what is it for?
And, if this prefab.deps realy need, can I update it dynamically? From AddPrefabPostInit for example?