SwiftUI Picker Doesn't Allow More than 8 Elements.

The follow code will produce the following error.

Cannot convert value of type 'Binding' to expected argument type 'Binding<_>'

import SwiftUI

struct ContentView : View {
    @State private var KG: Int = 30;
    @State private var Adult: Bool = true;

    var body: some View {
        VStack {
            Picker(selection: $Adult, label: Text("Classification")) {
                Text("Adult").tag(true)
                Text("Pediatric").tag(false)
            }
            Picker(selection: $KG, label: Text("KG")) {
                Text("30").tag(30)
                Text("35").tag(35)
                Text("40").tag(40)
                Text("45").tag(45)
                Text("50").tag(50)
                Text("55").tag(55)
                Text("60").tag(60)
                Text("65").tag(65)
                Text("70").tag(70)
                Text("75").tag(75)
                Text("80").tag(80)
            }
            Button(action: {
                // Do Stuff
            }) {
                Text("Calculate")
            }
        }
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
#endif

Steps to reproduce are as a follows.

1. Create New Project (For Apple Watch)
2. Use SwiftUI
3. Replace the code in ContentView.swift with the above code.
4. Wait for the error.

I'm using XCode Version 11.0 beta (11M336w)

Expected Result

I would think that we would be allowed to have any number of Tagged Text Items within a Picker.