title: Jekyll/Liquid way to print numbers with separator character?
body: <p>I am printing large numbers in Jekyll (powered by Liquid), which by default does not perform any sort of formatting. I'd like to print integers with separator characters, e.g. render <code>12000</code> as <code>12,000</code>.</p>
  
  <p>I've looked for a filtering option in Liquid that supports this to no avail. Do I need to write my own extension/filter and do this myself?</p>