code: function formatError(err, helper, args) {
    err.helper = helper;
    define(err, 'args', args);
    return err;
  }
docs: Format an error message to provide better information about the
  helper and the arguments passed to the helper when the error occurred.
  
  @param  {Object} `err` Error object
  @param  {Object} `helper` helper object to provide more information
  @param  {Array} `args` Array of arguments passed to the helper.
  @return {Object} Formatted Error object