title: why $pushAll deprecated but $pullAll not?
body: <p>mongodb document said that $pushAll is <code>Deprecated since version 2.4: Use the $push operator with $each instead.</code></p>
  
  <p>so I changed all occur of {$pushAll:data} to {$push: {$each:$data}}</p>
  
  <p>It's a boring work!</p>
  
  <p>Do I need to replace {$pullAll: data} to {$pull: {$each:$data}}, then no need to do that in the future ?</p>
  
  <p>Or $pullAll will not deprecated in near future?</p>