title: unchecked checkbox with "Input::old()"
body: <p>I'm creating a checkbox in a view:</p>
  
  <pre><code>Form::checkbox('test', 'true', Input::old('test', true));
  </code></pre>
  
  <p>After unchecking the box, submitting the form and being redirected back:</p>
  
  <pre><code>return Redirect::back()-&gt;withInput()-&gt;withErrors($validation);
  </code></pre>
  
  <p>The checkbox is still checked - presumably because <code>'test'</code> doesn't exist in <code>"Input::old"</code> so it is reverting back to the default value.</p>
  
  <p>Any suggestions on how best to achieve this?</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>I've come up with a somewhat hacky way of getting the results I want:</p>
  
  <pre><code>$isChecked = true; // The default state
  // Check if the form has been returned "withInput"
  if(Input::old())
  {
      $isChecked = Input::old('test', false); // If the field has old data available use that, otherwise it is unchecked
  }
  echo Form::checkbox('test', 'true', $isChecked);
  </code></pre>
  
  <p>I'll write this into a function for reuse, but it seems a bit painful so any comments/suggestions would be great</p>
  
  <p><strong>Edit 2</strong>
  Sorry if not clear - to clarify:</p>
  
  <ol>
  <li>Form is loaded with checkbox checked</li>
  <li>I uncheck the checkbox and submit the form</li>
  <li>The form doesn't validate so I'm returned to the form</li>
  <li>The checkbox has re-checked itself - I would expect it to be unchecked, as per the user submitted data</li>
  </ol>
  
  <p>I assume this happens because if a checkbox isn't checked the element isn't included in the post data</p>