direction, accel, decel are the same right?

```js

["direction", "acce", "decel"].forEach(function( prop ) {
  Stepper.prototype[ prop ] = function( value ) {
    if ( typeof value === "undefined" ) {
      return priv.get( this )[ prop ];
    }
    priv.get( this )[ prop ] = value;
    return this;
  };
});