Nitpick at dynamic fields example

[alilloig]

Since that's the main difference between objects stored as df and objects stored as dof is that the former do not need to have the key ability, I believe is worth clarifying that on the example, or at least not having both objects that are gonna be used for df having key.

[damirka]

I agree that it makes sense to mark key as not necessary, but the idea is that you can own Mustache object, and it's intentionally an object which can be owned and taken off.

[alilloig]

My point was that you could see that df can own objects since Hat is also being attached, but by making Mustache a non object struct we made emphasis on the difference with dof.

But as I said, absolut nitpick!