Yves Biener
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Now the `App` contains a state which is a user-defined `struct` which is passed to the `handle` and `contents` callbacks for `Container`'s and `Element`'s. Built-in `Element`'s shall not access the `App.Model` and should therefore never cause any side-effects. User-defined events shall be used to act as *messages* to cause potential side-effects for the model. This is the reason why only the `handle` callback has a non-const pointer to the `App.Model`. The `contents` callback can only access the `App.Model` read-only to use for generating the *view* (in context of the elm architecture).