title: vuex is state.array.push reactive?
body: <p>Im a bit new to JS and vue and am not quite sure if i understood the documentation correctly. it says:</p>
  
  <blockquote>
    <p>Due to the limitations of modern JavaScript (and the abandonment of Object.observe), Vue cannot detect property addition or deletion. Since Vue performs the getter/setter conversion process during instance initialization, a property must be present in the data object in order for Vue to convert it and make it reactive.</p>
  </blockquote>
  
  <p>does this include normal arrays as well, or do elements in arrays not count as "properties" in javascript?
  I wish to do state.array.push(data) to an array. Is this the correct way to do it?</p>