message: Replaced key instead of appending
  Now that syntax is index@mills don't want to append anymore
diff: @@ -31,7 +31,7 @@ class NavigationStack extends React.Component<NavigationStackProps, NavigationSt
  var newKeys = currentKeys.slice(prevKeys.length);
  var keys = prevKeys.slice(0, currentKeys.length).concat(newKeys);
  if (prevKeys.length === keys.length && prevState !== state)
  - keys[keys.length - 1] += currentKeys[keys.length - 1];
  + keys[keys.length - 1] = currentKeys[keys.length - 1];
  return {keys, stateNavigator};
  }
  componentDidMount() {
  