Are we not supposed to be able to make custom Picker Styles? struct CustomPickerStyle: PickerStyle { static func _makeView<SelectionValue>(value: _GraphValue<_PickerValue<CustomPickerStyle, SelectionValue>>, inputs: _ViewInputs) -> _ViewOutputs where SelectionValue : Hashable { } static func _makeViewList<SelectionValue>(value: _GraphValue<_PickerValue<CustomPickerStyle, SelectionValue>>, inputs: _ViewListInputs) -> _ViewListOutputs where SelectionValue : Hashable { } }

For the CountdownDuration initializer, since passing nil to both parameters of public init(preAlert: TimeInterval?, postAlert: TimeInterval?) is not considered valid, shouldn't the function signature be changed to be two separate inits, instead of a runtime error. EX: public init(preAlert: TimeInterval, postAlert: TimeInterval?) public init(preAlert: TimeInterval?, postAlert: TimeInterval)