In a SwiftUI product editing screen, the parent view owns the product model and a child view edits just the price field. Among @State, @Binding, and @Observable, which would you put where?
The parent view holds the product model in @State, the child editing view borrows just the price field as $product.price through @Binding, and only when the model has to be shared with other screens do you lift it into an @Observable class that the view that created it holds with @State.
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