title: Vuex getters with params
body: <p>I am wondering why can't I use vuex getter with property with default value like this:</p>
  
  <pre><code>getters: {
    getTest: (state, property = 'current') =&gt; {
       return state.test[property]
    }
  }
  </code></pre>
  
  <p>and when I use it like this <code>getTest.includes('something')</code> it doesn't work but if I use it like this <code>getTest().includes('something')</code> it works?</p>
  
  <p>Since when there are no params used it works without <code>()</code></p>