title: Is it safe to use "==" for comparison with null?
body: <p>I had used expression <code>obj != null</code> for countless times. Sometimes I use <code>null == obj</code>.</p>
  
  <p>I had read piece of scala standard library sources recently and discovered that <code>obj eq null</code> is the only form for comparison used there.</p>
  
  <p>Is it safe to use operator ( that is sugar to <code>.equals</code>) version for <code>null</code> comparison? May some implicit magic crush normal comparison logic with <code>==</code> version?</p>