title: How to override default option of "ActionView::Helpers::NumberHelper` methods
body: <p><code>ActionView::Helpers::NumberHelper</code> methods liked a <code>nubmer_with_precision</code> take <code>precision</code> option and default value of it is <code>3</code>.</p>
  
  <p>I want to set the default value <code>3</code> to <code>2</code>.</p>
  
  <p>Where should I write override method?
  And how to override the methods just only default value?</p>