Macro default_deserialize

macro_rules! default_deserialize {
    (@inner
        $(#[$ty_attr:meta])*
        $ty_vis:vis struct $name:ident { $(
            $(#[$field_attr:meta])*
            $field_vis:vis $field_name:ident: $field_ty:ty
        ,)* $(,)? }
    ) => { ... };
    ($($token:tt)*) => { ... };
}

Provide a deserialization for UiSettings that can handle malformed fields.