title: What is the difference between setting properties in a constructor vs in the properties getter?
body: <p>In Polymer 2 docs, they show using the constructor to set this.owner = "daniel" and then later they show how to set properties using static get properties(). </p>
  
  <p>In JSConsole, I can use myelement.owner and myelement.prop1, and if I dir(myelement) I can see both owner and prop1 there... so what's the difference?</p>