title: Object doesn't support property or method 'set' in microsoft edge
body: <p>this code doesn't work in Microsoft Edge:</p>
  
  <pre><code>let formdata = new FormData;
  formdata.set('name', this.form.name);
  </code></pre>
  
  <p>error:</p>
  
  <pre><code>Unhandled promise rejection TypeError: Object doesn't support property or method 'set'
  
  description: "Object doesn't support property or method 'set'"
  message: "Object doesn't support property or method 'set'"
  number: -2146827850
  stack: "TypeError: Object doesn't support property or method 'set' at l.methods.sendData
  </code></pre>