How to create a simple Binding for previews : <p>With the new <code>@Binding</code> delegate and previews, I find it kinda awkward to always have to create a <code>@State static var</code> to create the neccesarry binding:</p>

<pre class="lang-swift prettyprint-override"><code>struct TestView: View {
    @Binding var someProperty: Double
    var body: some View {
        //...
    }
}

#if DEBUG
struct TestView_Previews : PreviewProvider {
    @State static var someProperty = 0.7
    static var previews: some View {
        TestView(someProperty: $someProperty)
    }
}
#endif

</code></pre>

<p>Is there a simpler way to create a binding, that proxies a simple values for testing and previewing? </p>
