title: Request::has() returns false even when parameter is present
body: <p>URL: <code>http://localhost/?v=</code></p>
  
  <p>Code:</p>
  
  <pre><code>Route::get('/', ['as' =&gt; 'home', function()
  {
      dd(Request::has('v'));
  }]);
  </code></pre>
  
  <p>Output: <code>false</code></p>
  
  <p>What is going on? Is this a bug or am I doing something wrong?</p>