title: Input value is a string instead of a number
body: <p>When i add a number to the input  it doesn't change the value that stays at 5 and when i go in the console and type uw.value i get "6" back instead of 6 which i typed in the input on the web how do i get a number back instead of a string?</p>
  
  <pre><code>&lt;form&gt;
      &lt;input type="number" id="wakken" type="number" value=5&gt;&lt;br&gt;
      &lt;input max="30" min="0" name="ijsberen" placeholder="Ijsberen" id="ijsberen" type="number" value= "5"&gt;&lt;br&gt;
      &lt;input max="30" min="0" name="wakken" placeholder="Penguins" id="penguins" type="number" value= 0&gt;&lt;br&gt;
      &lt;input type="button" value="submit" onclick="check()"&gt;
  &lt;/form&gt;      
  </code></pre>
  
  <pre><code> var uw = document.getElementById("wakken")
   var ui = document.getElementById("ijsberen")
   var up = document.getElementById("penguins")
  </code></pre>