Spinner arrow keys not working

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[ ] feature request
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When I try to spin with arrow keys, it shows NaN value.
I saw in the code that you lacked to pass the parameter of the original event.
So, here is the FIX.

{
   key: "onInputKeyDown",
   value: function onInputKeyDown(event) {
     if (event.which === 38) {
       this.spin(event, 1);
       event.preventDefault();
     } else if (event.which === 40) {
       this.spin(event, -1);
       event.preventDefault();
     }
   }
}