/**
  * Set a new default ratio for passing a vote.
  * Only available to Admin.
  * @param float $ratio In range [0,1] or -1 to disable votes
  * @param bool $multicall
  * @return bool
  * @throws InvalidArgumentException
  */
 function setCallVoteRatio($ratio, $multicall = false)
 {
     if (!Structures\VoteRatio::isRatio($ratio)) {
         throw new InvalidArgumentException('ratio = ' . print_r($ratio, true));
     }
     return $this->execute(ucfirst(__FUNCTION__), array($ratio), $multicall);
 }