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0c6e3416d8
Previously we didn't distinguish between canceling the menu (which popped the route with no return value, i.e. null) and explicitly selecting an item whose value is null (pop with value null). Both fired onChange(null). Now we box the return value so we can distinguish the two cases. I would have preferred to just disallow "null" as a value but it turns out people like being able to use "null" as a value for much the same reason we do, and it seems best for us to pay the complexity cost of boxing than having everyone else do it. :-)