title: Vue.js - how to display my Vue instance property in dev tools?
body: <p>I know I can add a global property like so:</p>
  <p><code>Vue.prototype.$thing = { foo: 'bar' };</code></p>
  <p>and I know I can update that instance prop with:</p>
  <p><code>Vue.prototype.$thing = Vue.observable({ foo: 'bar' })</code></p>
  <p>But how can I view this property in the dev tools? Specifically, how do I get this instance property to display in the data tree along with the other properties defined in the data prop?</p>