title: Ruby gem 'mongo' insert number as long
body: <p>I'm using <code>mongo</code> gem in ruby and i want to insert some record and i want the value to be stored as <code>NumberLong</code> </p>
  
  <p>Via mongo ssh console I can do something like this
  <code>db.somecoll.insert({"key" : NumberLong("123456789"})</code></p>
  
  <p>and when I'll use find I'll get that field as <code>NumberLong</code>.
  How can I do the same insert query via <code>mongo</code> ruby gem?</p>
  
  <p>Thanks ahead</p>