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Prefabs

Stray Notes:

In the Editor, if you have a reference to a Component or GameObject inside a PrefabInstance GameObject, and you unpack the Prefab completely, your old reference will still be valid. ¹⁾ The new unpacked objects will have new GlobalObjectIds though.
In the Editor, prefabs have two GlobalObjectIds.
Referencing a gameobject to itself inside of a prefab will result in that reference being to the prefab, not the instance of the prefab.

¹⁾

It's untested whether this is because:

The reference *is* the same. Unpacking doesn't actually create new Objects, rather it just re-uses the existing ones.
Unity creates a set of new Objects for the unpacked prefab, and then fixes up all old reference pointers.